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