Possess all possessable creatures in the game at least once.

Kill every creature in the game at least once.

ill (or possess) every creature on a level.

Make it to a level boss as a ghost, without possessing anyone.

Defeat a level boss using a body from an earlier level.

Make it through an entire level using only one body.

Make it to the surface, possessing only 10 creatures or fewer (one per level).

Make it to the surface without exiting any still-living bodies.

Make it to the surface without possessing any living humans.

Make it to the surface without possessing any living sapient creatures.

Make it to the surface without possessing any living non-humanoid animals.

Make it to the surface, possessing only corpses and map features.

Make it to the surface, possessing only undead, constructs, corpses or map features.

Make it to the surface without damaging or possessing any creature that's not already hostile towards you.

Make it to the surface without possessing any living ratlings.

Kill an enemy by exploding your body.

Kill an enemy with an explosion from a body that exploded because it was killed by exploding your current body.

Kill an enemy by knocking them into something.

Kill an enemy by knocking them into a pit.

Exit a body with full health.

Play 500 total turns as a ghost (across any number of playthroughs).

Possess your own dead body on the surface.

Possess 100 creatures (across any number of playthroughs).

Escape the Graveyard.