Here is the full list of all 90 Coin Crypt achievements.
Find 50 Doubloons
Beat 3 Piggy Banks
Beat the Sorceress
Get the Gods' reward
Enter the forge
Get to world 3 in the crypts
Beat 3 Undeads
Unlock 9 classes
Earn $15,000 in a single run
Get to world 3
Find 20 Bramble Pieces
Beat the Mega Ectoplasm
Beat 3 Rogues
Beat 3 armors
Beat 3 Ectoplasms
Beat 3 Musicians
Get to world 2
Enter the Crypts
Get to world 2 in the crypts
Clear the first level
Beat the game with 10 classes
Unlock all classes
Discover 80 coins
Discover 30 types of enemies
Attempt 50 runs
Climb the mountain 10 times
Beat all 3 secret bosses and finish a run
Get to the bottom of the mountain
Beat the forge 10 times
Discover all coins
Discover all enemies
Donate $500 total to Bullion
Donate $500 total to Sacagawea
Donate $500 total to Kaichin
Donate $500 total to Ouguiya
Donate $500 total to Loonie
Donate $500 total to Frank
Donate $10,000 total to deities
Find 7 Chaos Chips
Find 3 Cryptcoins
Find 10 hidden chests
Beat 3 Cardinals
Beat a Corruptor
Beat the Ghost King
Beat the Gold Idol
Beat the Tycoon
Beat the Queen
Beat the Lootmaster
Beat the Archbishop
Beat the Shadomega
Beat Bullion
Beat Sacagawea
Beat Kaichin
Beat Ouguiya
Beat Loonie
Beat Frank
Beat the game with every class
Collect all secrets
Beat 3 Old Explorers
Beat 3 Grandmas
Gain entry to Sky World
Gain entry to Sea World
Unlock ALL classes
Donate $500 total to Rubo
Use 10 wishing wells
Get 10 ghost blessings
Give 10 status effects to enemies
Earn $25,000 in one run
Find 5 secret chests in crypts
Deal 200 or more damage in a single strike
Have your maximum HP exceed 30
Win a run without dealing any damage
Defeat 3 Angels
Defeat 3 Swabbie Spirits
Defeat 3 Lost Kids
Defeat 2 Anubises
Defeat 2 Prodigies
Defeat EVERY enemy
Collect EVERY coin
Beat the game with EVERY class
Collect ALL secrets