Calcium Contract achievements

Kill an invisible jester

Kill a treasure rooster with a scythe just before it disappears

Kill a flying sniper just before they take their shot

Catch a treasure

Finish the Docks

Deflect 7 enemy projectiles with a single scythe swing

Get killed by an exploding corpse

Get a little too eager when chasing the Serpent

Finish the Mountain Halls without picking any yeller skulls

Freeze 7 enemies at the same time

Don't kill any cats in the Cats Temple

Finish the Caves in under 3 minutes in one go (no rewinding, no loading)