Kill 1 brain 1
KILL_1_BRAIN_183.9%

Achievements and their recorded unlock rates.
Loading your Steam progress…
KILL_1_BRAIN_1KILL_1_BRAIN_3START_GAMEKILL_1_BRAIN_4KILL_1_BRAIN_2KILL_10_BRAIN_1KILL_10_BRAIN_2KILL_10_BRAIN_4KILL_10_BRAIN_3KILL_25_BRAIN_1KILL_25_BRAIN_4KILL_25_BRAIN_3KILL_25_BRAIN_2TAKE_LIFETAKE_TIMETAKE_SHIELDKILL_50_BRAIN_1KILL_50_BRAIN_4KILL_50_BRAIN_3KILL_50_BRAIN_2TAKE_DYNAMITEKILL_75_BRAIN_4KILL_75_BRAIN_1KILL_75_BRAIN_3KILL_75_BRAIN_2KILL_100_BRAIN_1KILL_100_BRAIN_4KILL_100_BRAIN_3KILL_100_BRAIN_2KILL_250_BRAIN_4KILL_250_BRAIN_1KILL_250_BRAIN_3KILL_250_BRAIN_2HOLD_180_SECONDSKILL_500_BRAIN_4KILL_500_BRAIN_1KILL_500_BRAIN_3KILL_500_BRAIN_2KILL_750_BRAIN_1KILL_1000_BRAIN_4KILL_1000_BRAIN_1KILL_1000_BRAIN_3KILL_1000_BRAIN_2KILL_2500_BRAIN_1KILL_2500_BRAIN_4KILL_2500_BRAIN_3KILL_2500_BRAIN_2KILL_5000_BRAIN_1KILL_5000_BRAIN_4KILL_5000_BRAIN_3KILL_5000_BRAIN_2KILL_7500_BRAIN_1KILL_7500_BRAIN_2KILL_7500_BRAIN_3KILL_7500_BRAIN_4KILL_10000_BRAIN_4KILL_10000_BRAIN_3KILL_10000_BRAIN_2KILL_10000_BRAIN_1