Here is the full list of all 17 Temporal Temple achievements.
Unlock Dan
Unlock Mary
Watch the credits. Thanks!
You found it!
Unlock Big Tam
Unlock Jakarta
Jump 69 times in a single run
Die 25 times
Use the chest three times in a single run
Unlock Bone Boy
Kill a haunted enemy
Kill five Big Guys in a single run
Last over 60 seconds in a single run
Last at least 30 seconds in a single run
Use the Healing Shrine to recover health
Purchase a weapon from the chest
Purchase an item from the shop