Kill a Necromorph with every Weapon in the game (single player only).

Kill 50 enemies using the Flamethrower

Kill 20 enemies with Detonator Mines in a deployed state

Impale an enemy with the Javelin Gun and use its Alt-Fire to shock 3 others (single player only)

Kill 6 enemies at once with Line Gun's Alt-Fire (single player only)

Simultaneously have four completely upgraded weapons

Kill 25 crawling enemies with Stomp (single player only)

Survived the nightmare, and everything in between.

Completed the game on Nightmare difficulty or higher.

Reminisced about every moment from your past. (Ch. 12)

Brought your own equipment to the barbecue this time. (Ch. 14)

Observed all Residual Memories.