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Data from Steam — Steam Web API Terms of Use. Last updated .
| Achievement | How to unlock | Unlocked by | Rarity |
|---|---|---|---|
| Looks like we've found our prize | Complete Chapter IV on Hard difficulty or in Challenge Mode | 5.2% | Rare |
| You're a hero now | Complete Chapter III on Hard difficulty or in Challenge Mode | 5.8% | Rare |
| Internet high five | Finish a co-op mission (other than Prologue) | 6.1% | Rare |
| Most experienced in the group | Complete Chapter II on Hard difficulty or in Challenge Mode | 6.2% | Rare |
| River of mystery | Find all collectibles in Chapter V | 7% | Rare |
| Complete Chapter I on Hard difficulty or in Challenge Mode | 7.2% | Rare | |
| Find all collectibles in Chapter IV | 9.3% | Rare | |
| — | 9.8% | Rare | |
| — | 10% | Rare | |
| Find 10 collectibles | 10.1% | Rare | |
| — | 10.3% | Rare | |
| Kill 20 enemies, using Helga as a decoy | 10.3% | Rare | |
| — | 14.8% | Rare | |
| — | 16.4% | Rare | |
| Kill 20 enemies during an airstrike | 16.9% | Rare | |
| Find all collectibles in Chapter I | 17.4% | Rare | |
| — | 19.5% | Rare |