Overthrow the aliens at any difficulty level

Overthrow the aliens on Commander difficulty

Overthrow the aliens on Legend difficulty

Build an experimental item in the Proving Grounds

Make contact with a region

Complete the tactical tutorial

Upgrade a facility

Sell goods worth 1000 supplies to the Black Market (Can span multiple games)

Complete a Rumor

Kill a Sectopod on the same turn you encounter it

Complete a successful ambush

Hack and take control of a Sectopod

Evacuate a soldier whose bleed-out timer is still running

Upgrade a weapon

Completely upgrade a beam weapon with superior grade weapon upgrades

Kill a Berserker in melee combat

Kill a Viper who is strangling a squadmate

Kill a Sectoid who is currently mind controlling a squadmate

Kill an enemy with a hacked turret

Build a facility in every Avenger slot

Sabotage an alien facility

Cause an enemy to fall to its death

Cause an enemy to die in a vehicle explosion

Beat the game on Commander+ difficulty by July 1st (July 15th for War of the Chosen)

Beat the final mission using only conventional gear

Beat the game on Commander+ difficulty without buying a Squad Size upgrade

Beat the game on Commander+ without losing a soldier

Kill 500 aliens. (does not have to be in same game)

Win a multiplayer match.

Beat a mission on Commander+ with a squad composed entirely of soldiers of the same class (but not Rookie)

Beat a Retaliation mission with no more than 3 civilian deaths

Earn a second tier hack reward

Kill an enemy with every heavy weapon in the game (Doesn't have to be in the same game)

Build a radio relay on every continent

Get all of the continent bonuses available in a single campaign

Beat a mission in June or later using only Rookies

Skulljack each different type of ADVENT soldier (does not have to be in same game)

Skulljack an ADVENT Officer

Apply a PCS upgrade to a soldier

Kill 3 enemies in a single turn, with a single soldier, without explosives

Beat the game on Commander+ difficulty in Ironman mode

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 Assemble' 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