Full list of all 13 Staff Only achievements.
The base game contains 10 achievements, and there is 1 DLC pack containing 3 achievements.
Win 10 battles when your HP ≤ 5
Upgrade your cards by 50 total
Buy 20 cards
Win a battle with a first boss
Win a battle with a second boss
Win a battle with 3 elite enemies in a single run
Clear all battle rooms
Place 9 cards on the game board
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Collect 50 energy
Buy an Ammo card
Win 4 normal battles
Deal 30 damage with a single acid token