Complete the indicated task to unlock the achievement.

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.