- Estimated achievement difficulty:1/10
- Offline: 63 
- Online: 2 
- Approximate amount of time to 1000: 20-30 hours
- Minimum number of playthroughs needed: 1 playthrough + 80 individual missions
- Missable achievements: None
- Does difficulty affect achievements: No
- Unobtainable/glitched achievements: Multiple achievements unlock late
- Extra equipment needed?: No
"Defense Grid 2 is a strategy game where you place defensive fortifications (towers) to stop invading aliens from stealing your power cores. It's up to you to select the towers, placement, and timing to best protect your base. If you can make it through the alien invasion and finish the mission with one or more cores remaining, you will succeed in pushing back the aliens. Gold, silver, and bronze medals are awarded for protecting more cores and spending the least amount of resources possible to win." -Defense Grid 2 manual
Most maps permit you to modify the path the aliens take by placing towers on their current path, and as you progress through the game more tower types and customizable features become available. There is a Story mode (although the actual story is a bit incomprehensible) and then each map used in the Story mode is available to replay in ten or so variants. There are four difficulty levels available and you can earn all achievements on Easy, so if you find anything challenging feel free to turn down the difficulty. The game supports co-op both via LIVE and sharing the screen with two controllers, and has a multiplayer mode tacked on as well that predictably enough is largely bereft of players.
Initially, you will want to simply go through the game in Story mode so that you can unlock all of the maps. If you can get gold on the levels that reduces the replays you will need to do, but if you are struggling wait until you unlock more tower items and come back. After the Story mode is complete, I suggest going through each map on Practice mode ensuring you get gold on each level. At this point you should have enough tower items unlocked to beat any map for a gold medal in any mode on any difficulty level (although the higher difficulties are quite skill dependent as well).
You will need 100 gold medals across all the maps, which works out to an average of five golds per map (the Prologue can only be played in Story mode). You will need to get gold on each map in Story mode for Alien Tears, leaving 79 remaining. The five easiest modes are:
- Practice (large initial starting resources and much faster generation of resources in-game)
- Grinder (only opponents are walkers, and many maps can be won with 4-6 Concussion towers and a Temporal tower)
- Super Grinder (lots of opponents, but strung out nicely and lots of time to build defenses in depth)
- Out of Bullets (no Cannon or Gun towers, so use Lasers and Concussion towers instead)
- Fixed Resources (you get all your resources at the start of the game)
Note that multiple people have reported issues with achievements not unlocking when they should. The developer's forum has several posts from employees pointing the finger at the Xbox achievement detection system rather than their code, so this may or may not get patched in the future. Typically, they all do unlock at some point, it just may require getting 150+ golds instead of 100...
All achievements unlock at the end of missions rather than in-game.
You will need to play and win one DG Fighter multiplayer game which can be easily done by inviting a friend. You will also need to get a gold medal in co-op, either with a second controller (and this can be easily done with one person using both controllers) or over LIVE with a friend.
There are several miscellaneous achievements that you can get along the way or by specifically focusing on them at some point. See the guide for specific details for each achievement after you have completed the Story mode.
If you share your Xbox One with other local players, Defense Grid 2 seems to share a single save file with all players on the console. This may interfere with easily tracking which missions you have gold in, affect achievements unlocking correctly, etc. It is strongly recommended that you complete the game before sharing it with others on the same console to avoid these problems.
Overall this is a very well done tower defense game, and a worthy successor to the Xbox 360 Arcade title. It has great replay value and the developer has a history of releasing quality additional content. The issue with achievements not unlocking on time seems reasonably rare but does not appear likely to be patched as of this writing.
[XBA would like to thank Creech for this roadmap]