Full list of all 88 XCOM 2 achievements.
The base game contains 50 achievements, and there are 4 DLC packs containing 38 achievements.
Investigate the Abandoned Research Facility
Kill the Viper Ruler
Kill the Berserker Ruler
Kill the Archon Ruler
Kill all alien rulers in a single game
Purchase all of the final tier Hunter Weapons
Use all ruler armor abilities in a single mission
Use a ruler armor ability against an alien ruler
Kill an alien ruler the first time you encounter it
Kill an alien ruler while it attempts to escape
Beat the Lost Towers mission
Promote a SPARK unit to Champion rank
Complete a mission with three or more SPARK units in the squad
Defeat an Avatar with a SPARK unit
A SPARK unit survives a mission it started with less than half health
Outfit a SPARK unit with the highest tier weaponry and armor
Hit three shots on a single turn with a SPARK unit after using its Overdrive ability
Defeat a robotic enemy with a SPARK unit
Build a SPARK unit
Kill an enemy primed Derelict MEC before it can self-destruct
Complete the Lost and Abandoned mission
Permanently defeat one of the Chosen
Get 15 Headshots against Lost in a single turn
Get four kills from Shadow mode with a Reaper in a single mission
Raise a Templar to maximum Focus level, spend it all, and reach the max again in a single mission
Perform three offensive actions against the same target with a Skirmisher in a single turn
Form a level 3 bond between two soldiers
Complete a mission with all Tired soldiers and no casualties
Raise XCOM's influence with all three factions to High in a single game
Rescue a soldier who was captured by the Chosen
Complete the 'Blast From the Past' legacy operation with a gold medal
Complete the 'It Came From the Sea' legacy operation with a gold medal
Complete the 'Avenger Assembled' legacy operation with a gold medal
Complete 'The Lazarus Project' legacy operation with a gold medal
Complete a random legacy operation
Complete a Skirmish Mission
Complete a Local Challenge
Complete a single player campaign with Tactical Legacy Pack content