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Data from Steam — Steam Web API Terms of Use. Last updated .
| Achievement | How to unlock | Unlocked by | Rarity |
|---|---|---|---|
| Capped | Upgrade a skill to max level | 5.6% | Rare |
| No one left behind | Revive a player in multiplayer | 5.7% | Rare |
| Group therapy | Kill 4 enemies with a single attack | 6.6% | Rare |
| Teachers Lounge | — | 7.1% | Rare |
| Keycard 1 | Find the first secret keycard | 8% | Rare |
| Explode kill 50 zombies | 8.1% | Rare | |
| Complete level 6 | 8.2% | Rare | |
| Earn an S rank on any level | 9.5% | Rare | |
| Kill a zombie using a dinosaur | 9.5% | Rare | |
| — | 10.1% | Rare | |
| Play a multiplayer game online | 10.2% | Rare | |
| — | 11% | Rare | |
| Superdodge 30 times | 11.8% | Rare | |
| Buy something from a shop | 13.8% | Rare | |
| — | 14.2% | Rare | |
| Finish a level in 1st place while playing multiplayer | 16.2% | Rare |