Better Dying Through Science

 is the third level of the Bunker chapter.

Completing it unlocks Marie Curie.

Find and open all the treasure chests
Reward: XP


 * Inside the waiting room, behind the broken glass in the first ward.
 * Inside the central stasis cell, to access it, allow the monsters to get out.
 * In the cell with the roach cavalry, beyond the stasis cells.
 * After the room with the lasers, on the catwalk (not the passage with the flames).
 * Next to the switch opening the door, in the lab you enter after the death laser room.
 * After the aforementioned room, go right, rather than then left. It's up the stairs.
 * The final chest of the level.

Find and destroy all the Zombie Chickens
Reward: XP


 * In the corridor after the stasis lab.
 * Inside the second stasis lab, the first cell.
 * Off the catwalk after the laser room.
 * Next to chest #6.
 * After the Nibbles are introduced, the final chicken is inside the room they burst out of.

Find and kill the Blood Top that escaped from the mall
Reward: XP

He's located in the second stasis cell laboratory, along with the hippie zombie.

Avoid the lasers
Reward: Arnaud You Don't

Don't get hit by the death laser. That is all.

Complete the entire level without any characters dying
Reward: XP

Self-explanatory.

Avoid all of the Hybrid mind rays
Reward: The Drum of Estienne

Self-explanatory. The challenge is active while fighting in the secret room.

Complete the level in nine minutes or less
Reward: XP

Self-explanatory.

Avoid being hit by turrets
Reward: XP

Self-explanatory. Note that you can dodge the lasers by entering side rooms and that is indeed the intended method of navigating. This may take a few tries to accomplish, though. The second time you just need to reach the teleporter into the secret room.