Here is the full list of all 52 Dark Envoy achievements.
Interact with 20 points of interest in one playthrough
Defeat the final boss on Easy difficulty or higher
Defeat the final boss on Normal difficulty or higher
Defeat the final boss on Hard difficulty or higher
Defeat the final boss on Insane difficulty
Complete Benedict’s Companion Quest
Complete Leon’s Companion Quest
Complete Sestia’s Companion Quest
Complete Tet/Kim’s Companion Quest
Complete Vasso’s Companion Quest
Finish act 1
Finish act 2
Finish act 3
Finish the game
Lead your faction to victory in the Research Facility
Pass all of the Ancients' puzzles
Recruit Benedict
Recruit Kim or Tet
Recruit Leon, Vasso and Sestia
Open the secret vault in the Forbidden Fortress
Interact with the point of interest at the end of the dock in Free Phoenicia
Craft a Tier III item
Finish a level without using any healing fountains
Finish all companion quests available in one playthrough
Have 3 unique draw skills active at once
Have 5 units simultaneously summoned
Have all 4 characters simultaneously afflicted by a disabling effect (stun or similar)
Kill 5 enemies with one skill cast
Kill an ally by triggering an explosive barrel (or similar element of environment)
Max out an attribute
Reach lvl 10
Research all upgrades in one research branch
Unlock the 3rd level of your base class's ultimate skill
Unlock the 3rd level of your specialization's ultimate skill
Kill an enemy with unarmed attacks
Explore 6 random dungeons in one playthrough
Collect 10000 gold
Collect 15 unique items
Craft 20 items
Enchant 20 items
Heal 5000 hp points in total
Kill 500 enemies
Kill 1000 enemies
Kill 5000 enemies
Kill 15 enemies using weapon skills
Make 10 story choices in one playthrough
Read 30 notes or journals in one playthrough
Research 10 upgrades
Spend 20000 gold in total
Spend a total of 30 minutes in tactical mode in one playthrough
Use waypoints 20 times in total
Destroy each type of explosive environment in one playthrough at least once