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