| Achievement | How to unlock
|
|---|
| Divine Retribution | Kill the level twelve boss.
|
| Every Nook and Cranny | Find all the secret rooms and hidden items.
|
| Four's a Crowd | Blow up at least four enemies with one shot.
|
| Grave New World | Get killed by an environmental hazard like poisonous water, lava, or a trap.
|
| Hide and Seek | Kill the level four boss.
|
| I Don't Get It... | Spend three minutes trying to get past the gate in the first level of the expansion pack.
|
| Insane Time Traveler | Beat the game on hard without dying using only your first weapon.
|
| Invincible Time Traveler | Beat the game without dying.
|
| Just a Flesh Wound | Get killed by the fan on level four.
|
| Lest Ye be Judged | Kill the level sixteen boss.
|
| Mega Destroyer | Use the OP Mega Destroyer for the first time.
|
| Mirror, Mirror | Kill the level three boss of the expansion pack.
|
| Noob Fail | Die for the first time.
|
| Out on a Limb | Shoot off a total of fifty enemy limbs.
|
| Pink Mist | Gib enemies into a total of 500 chunks.
|
| Put out That Light! | Destroy twenty light sources (light bulbs, etc.)
|
| Riddle of the Sphinx | Kill the level eight boss.
|
| Right Back Atcha | Kill an enemy with the Reflector.
|
| Seasoned Time Traveler | Beat the game on hard.
|
| Self-Harm | Get killed by your own weapon.
|
| Skilled Time Traveler | Beat the game using only your first weapon.
|
| Speedy Time Traveler | Beat the game in ninety minutes or less.
|
| Thanks a Million | Watch the credits at the end of the game.
|
| This Level is Bugged! | Spend three minutes trying to get past the gate in the first Egypt level.
|
| Time Traveler's Starter Kit | Find all the unique powerups, including Invisibility, the Reflector, and the Chojin Mask.
|
| Time Traveler | Beat the game.
|