Completely upgrade a beam weapon with superior grade weapon upgrades

Kill an Avatar

Kill a Sectopod on the same turn you encounter it (in Single Player)

Promote a SPARK unit to Champion rank

Cause an enemy to fall to its death

Build an experimental item in the Proving Grounds

Kill a Berserker in melee combat

Skulljack an ADVENT Officer

Recover the Blacksite Data

Build Resistance Comms

Apply a PCS upgrade to a soldier

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