- Estimated achievement difficulty: 4/10 [Achievement Difficulty Rating]
- Offline: 55 
- Online: 2 
- Approximate amount of time to 1000: 80-100 hours [Estimated Time to 100%]
- Minimum number of playthroughs needed: 1 [with proper planning on all the missable achievements]
- Missable achievements: 5 [Boot Licker (15G), Archivist (25G), Audiophile (25G), Fit as a Fiddle (25G) and Ironheart (25G)]
- Does difficulty affect achievements: No, you can play on Easy
- Unobtainable/glitched achievements: N/A
- DLC: Bloody Ties
- Difficulty: 7/10 [highly skill dependent]
- Time to 115: 8-10+ hours [highly skill dependent]
- Unobtainable/Missable: Connoisseur (20G) is missable; one of the boss fights for True Champion (20G) is bugged and much more difficult to complete with a gold medal than its original release
Dying Light 2 is the long-awaited sequel to Dying Light, and is a post-apocalyptic, parkour-infused survival action RPG developped by Techland. You're looking at about 20 hours for the main story and about 50-60 hours to complete every side quest, but getting all the achievements will take a bit longer than that as there are some very grindy ones. Your main concern when playing this game should be collectibles. There are 250 of them and some of them are missable, including the one in the Prologue, so be very careful with that and make sure to not miss them or you might have to restart a complete playthrough. Thankfully, other than the Prologue one, the rest can be obtained in someone else's game via co-op if you miss them, but they still need to be your top priority as you're progressing.
Step 0 - Missable achievements:
- Fit as a Fiddle (25G) and Ironheart (25G) are both marked as missable and are not mutually exclusive (meaning you aren't guaranteed to unlock one). Not only is it impossible to max out both health and stamina with the amount of inhibitors in the game, but if you split the inhibitors equally between health and stamina you will actually miss both achievements! Refer to Ironheart (25G) for an explanation of how to ensure you get both of these achievements in the same playthrough.
- Boot Licker (15G) is missable because you cannot reach level 7 for both factions; the maximum you can reach is level 10 which means if you're not careful, you could end up at level 5 for both factions and completely miss this achievement. So be sure to assign the zones to the same factions from the start to avoid this. This is pretty easy to do - every time you complete a water tower or electrical station and get prompted to choose a faction, it doesn't matter which you choose as long as you always choose the same faction.
- Archivist (25G) and Audiophile (25G) is missable because there are collectibles placed in missable locations in the game, most notably in the Prologue itself (one memento), so be careful when starting the game and make sure you collect the three Prologue collectibles before moving on. One memento in the Prologue is only available there, whereas all other collectibles, if missed, can be collected by joining someone's game who still has access to those locations. Even so, it'd be a lot of work to try to find various people at the appropriate spot in the game for you, so it's best to refer to the links in Archivist (25G) and follow the collectible roadmap laid out in them to ensure you don't miss any mementos or tapes.
First things first, be very careful and make sure to grab all the collectibles during the Prologue of the game, because they are all HIGHLY missable as you cannot access the Prologue area later in the game. There are only three collectibles in the Prologue but it is very important to pick them up. One is story-related and one actually does respawn in the open world (leaving only one technically missable), but still best to ensure you get all three mementos during the Prologue.
Continue with the story but feel free to do as many side quests as you want; I would simply say that some locations will become locked out after meeting with Veronika Ryan (Known Associate (20G)). It's pretty late in the game and some areas also become locked out after completing the next main quests, and they all contain collectibles. These collectibles can still be picked up through online co-op if you happen to miss them, but just to be sure it would make sense to collect them as you go. Try to pick up as many collectibles during the story, they are not all missable but that will avoid some backtracking.
During the story, you'll automatically assign a couple zones to a faction of your choice. It is very important to assign all zones to the same faction because there aren't enough of them to reach City Alignment 7 with both factions, and you could possibly miss Boot Licker (15G).
You will collect inhibitors thoughout the game which will be used to upgrade either your health or your stamina. However, there aren't enough inhibitors in the game so you won't be able to upgrade both to max level. See Ironheart (25G) for a rundown of how many you can spend safely without locking yourself out of either achievement.
You will unlock 16 achievements in this step and possibly six more.
Step 2 - Clean up and grind:
After you're done with the story, you can still continue to play, but unfortunately some locations will be locked out so if you haven't picked up the missable collectibles/inhibitors in these locations, you'll have to pick them up through co-op if you find someone who still has the main quests available.
If you're good with the missables, use this step to clean up anything you haven't done before; maxing out your stats, leveling up your character and do the miscellaneous achievements and the grind.
By the time you're done with most other achievements, you will likely still need a skill or two for Parkour Master (25G) and Combat Master (25G). You probably won't have enough XP after you're done with every main and side quests, but thankfully there are some pretty simple methods to grind out the last of the XP you need. There is also an achievement for getting one million Old World Money for Who Wants To Be a... (15G), and it is very grindy. You won't be anywhere close to that amount of money after finishing everything. Thankfully, again, there is a very quick and easy way to grind out the rest of the money you need.
Lastly, and by far the most grindy, is Ultramarathon (15G). By the time you finish everything else, you won't even be close to halfway done with this achievement. Unfortunately there are no quick ways to grind this one out. You're stuck with many, many hours of grinding for this last achievement. For to its solution for a couple viable methods depending on how you prefer to grind.
Step 3 - Co-op:
The first paid DLC for Dying Light 2 starts by having a quest automatically added to your journal called 'First Blood.' Follow it and the second quest, 'Madmen of Villedor,' to really begin the DLC and gain access to the new area, Carnage Hall, where most of the content takes place. There is an achievement for getting a gold medal on all three challenges from 'Madmen of Villedor,' so be aware of that. I personally recommend doing them right away, which each challenge is fresh in your mind. Refer to The Madman of Villedor (20G) for tips in getting a gold in each.
The big thing to be aware of with this DLC is that, just like in the base game, there are missable collectibles. Specifically, there are a few side quests you need to get and complete that contain collectibles. This is also written up in Connoisseur (20G) but I'm repeating it here to make sure you don't miss anything:
- Near the beginning of the 'Fame or Infamy' mission, you'll do your first event for Severus, after which you'll wake up in your new saferoom, and exit out into the training room. It's here where two side quests become available, but the only one that matter is 'Backstory' from Rune. Make sure to accept it. There are four things to collect for this side quest, and all four are unmissable mementos (they're required to complete the quest)
- Right near the start of the 'Road to Perdition' main mission, you'll get an optional objective to meet Ogar in the metro. Make sure you do so. Not only is there a collectible right next to him, but you need to talk to him to get the 'The Only Hope' side quest. There's a collectible at the end of this quest line
- Shortly after the above, after another event or two for Severus, you'll hear Astrid's music playing from your room and automatically get the 'A Gilded Cage' side quest added, prompting you to go to Astrid's office. There are three collectibles that can only be gotten during this side quest, and they are optional and you can't return to this area, so make sure to get them
- Towards the end of 'Road to Perdition' (for me it was when I reached Fame 14), when you talk to Severus for your next event he'll tell you about a bunch of portraits that were stolen. Make sure to accept this quest, which is 'Portrait of a Hangover.' A bunch of collectibles are unmissable as part of this side quest
Dying Light 2 is a pretty fun game with a straightforward list, but it is filled up with a lot of collectibles and that is what is going to take you the most time. It won't take you 500 hours like they first announced, but it's definitely not a quick and easy completion.
[XBA would like to thank Necrophage33 for the 'Bloody Ties' DLC Roadmap]