- Estimated achievement difficulty: 5/10 [Achievement Difficulty Rating]
- Offline: 38 
- Online: 0
- Approximate amount of time to 1000: 35-45 Hours [Estimated Time to 100%]
- Minimum number of playthroughs needed: 1 [Chapter Select Available]
- Missable achievements: None
- Does difficulty affect achievements?: No
- Unobtainable/glitched achievements: 1 - "Goblin Master" [Currently Unobtainable]
- Extra equipment needed?: N/A
Styx: Shards of Darkness, sequel to 2014's Master of Shadows, sees the nasty green goblin Styx return for an even bigger and more dangerous mission in the Dark Elven city of Körangar. Similar to its predecessor, Shards of Darkness relies solely on stealth gameplay; Styx is fragile and so an action-oriented mindset will often lead to swift death. There are ten missions total within the narrative, each spanning anywhere from thirty to fifty minutes depending on your playstyle and pace. Moreover, there are thirty-eight achievements worth collecting, ranging from mission completion and ability/skill usage, to feats that involve completing missions stealthily, quickly, and quietly. In order to gain full completion, you will need to dedicate thirty or more hours to Styx's adventures.
Story Playthrough & Miscellaneous Tasks:
Since there are no difficulty-related achievements, you can choose whichever difficulty level suits your fancy upon starting the game. As mentioned above, the narrative is spread out across ten missions, each of which, with the exception of the Prologue, is split into two "zones." Completing each of the ten missions in the game will yield ten story-related achievements.
During this initial playthrough, you should focus on completing every mission with no kills and no alerts in order to unlock the gold Insignia of Shadow and the gold Insignia of Mercy. Unlocking these gold-tier Insignias for the first time will yield "Did you see something?" and "Sensitive Gob" respectively, and you will likely unlock "Untouched" for completing a mission without taking damage. Beyond these feats, you can also focus on some of the easier miscellaneous tasks such as crafting thirty items, hiding in fifty ducts, pickpocketing ten enemies, drinking twenty-five vials of amber, and collecting fifty raw materials.
There are also a few ability-related achievements worth working towards during this playthrough: "Rehab," for completing a mission without using amber powers; "Phoenix," for being saved by a life-saving clone; "Devoted Servants," for teleporting to a clone twenty times; "Lamb of God," for creating fifty clones; "The Gob in a Box," for being invisible while hiding in a chest during an enemy search; and "The Unseen Gob is the Deadliest," for being invisible for a cumulative total of one minute. Lastly, there are also achievements for unlocking your first ultimate skill and unlocking every skill in the game (there are forty in total).
Insignia of the Thief & Insignia of Swiftness – Mission Replay:
After your initial playthrough of the storyline and once all of the other miscellaneous and skill-related achievements are mostly out of the way, you will need to dedicate some time to each and every mission twice more. The reason for this is because in order to obtain the "All Along The Gobtower" achievement, you have to unlock the gold-tier Insignia for every Insignia (Swiftness, Shadow, Mercy, Thief) of every mission.
In regards to the Insignia of the Thief, this will require you to collect all twenty tokens in a mission (ten per zone). At this point, you should have enough Skill Points to unlock the "Greed" skill in the Perception talent tree; this skill allows you to see tokens through walls, which will prove to be useful during your mission replays. As for the Insignia of Swiftness, this will prove to be a tad difficult as you'll need to race against the clock to complete your objectives and the overall mission under a specific time constraint. It may seem daunting, but if you focus on this Insignia during your third mission playthrough, you should have no issue moving quickly throughout the zones/missions.
There should be very few achievements left at this point, some of which may have conflicted with your playstyle in earlier playthroughs. Such achievements include "The Professional" for killing all the enemies in zone, "THIS. IS. THOBEN!!," for pushing ten enemies off an edge, and Morpheus' Blade," for killing an enemy in their sleep. There are also achievements for escaping ten red alerts, killing five guards will acid traps, using vials of acid to dissolve ten bodies, and an Easter Egg specific to the third mission in the game. Feel free to refer to the guide below for more information on these last seven achievements, as they can all be obtained quickly through mission replay.
Styx: Shards of Darkness is another welcomed addition to the stealth genre and a worthy successor to Master of Shadows. At its core, it's a fantastic stealth title with impressive level design, smooth gameplay, and decent writing. It may take while to score the completion, but nothing stands out as overly difficult in this enjoyable, addictive title.
[XBA would like to thank BiggD for this Roadmap]