Here is the full list of all 31 Balatro achievements.
Have 80 or more cards in your deck
Break 2 Glass Cards in a single hand
Win a run on at least Black Stake difficulty
Win a run without rerolling the shop
Complete any challenge run
Play a Royal Flush
Discard at least 2500 Cards
Discover every Spectral card
Win a run in 12 or fewer rounds
Get any poker hand to level 10
Win a run on at least Red Stake difficulty
Discover every Planet card
Play at least 2500 Cards
Score 1,000,000 Chips in a single hand
Win a Run
Discover a Legendary Joker
Reach Ante 8
Score 10,000 Chips in a single hand
Reach Ante 4
Discover every Tarot card
Win a run on at least Gold Stake difficulty
Have $400 or more during a single run
Play a Flush with 5 Wild Cards
Buy 5 Vouchers by the end of Ante 4
Score 100,000,000 Chips in a single hand
Thin your deck down to 20 or fewer cards
Complete every challenge run
Discover every Voucher
Discover 100% of your collection
Win with every deck on Gold Stake difficulty
Earn a Gold Sticker on every Joker