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Data from Steam — Steam Web API Terms of Use. Last updated .
| Achievement | How to unlock | Unlocked by | Rarity |
|---|---|---|---|
| Arcade Style Sixth Boss | Eliminate the sixth boss without assistance | 1.1% | Very rare |
| Arcade Style Fifth Mini Boss | Void the fifth mini boss's lifetime warranty without assistance | 1.1% | Very rare |
| A Hundred Games Played | Play a hundred games | 1.3% | Very rare |
| Arcade Style Fifth Boss | Eliminate the fifth boss without assistance | 1.5% | Very rare |
| Arcade Style Sixth Mini Boss | Pull the plug on the sixth mini boss without assistance | 1.6% | Very rare |
| Obliterate ten thousand enemies | 2% | Very rare | |
| Complete the game using only one credit in 2P single player without assistance | 2.3% | Very rare | |
| Send the tenth mini boss to hell without assistance in 2P single player | 2.3% | Very rare | |
| Eliminate the fourth boss without assistance | 2.4% | Very rare | |
| Eliminate the ninth boss without assistance in 2P single player | 2.4% | Very rare | |
| Eliminate the eight boss without assistance in 2P single player | 2.6% | Very rare | |
| Void the fifth mini boss's lifetime warranty without assistance in 2P single player | 2.8% | Very rare | |
| Eliminate the seventh boss without assistance in 2P single player | 2.8% | Very rare | |
| Help the third mini boss cross the rainbow bridge without assistance | 3% | Very rare | |
| Eliminate the sixth boss without assistance in 2P single player | 3.3% | Very rare | |
| Eliminate the third boss without assistance | 3.5% | Very rare | |
| Void the fifth mini boss's lifetime warranty in 2P single player | 4.1% | Very rare | |
| Pull the plug on the sixth mini boss without assistance in 2P single player | 4.1% | Very rare | |
| Seize a thousand enemies | 4.1% | Very rare | |
| Eliminate the fourth boss without assistance in 2P single player | 4.4% | Very rare | |
| Send the tenth mini boss to hell in 2P single player | 4.7% | Very rare | |
| Complete the game using only one credit in 2P single player | 4.9% | Very rare | |
| End the existence of the ninth boss in 2P single player | 4.9% | Very rare |