Defeat a squeaky foe.
Drain all of the water in the Aqeuducts.
It will live on in our memory.
Fix the malfunctioning Heater Core.
Clean up the Ventilation System.
Complete the game.
Finish the game without collecting a single health upgrade.
Complete the Heater Core before acquiring the Spin Jump.
Obtain the Repeater from Rebba.
Complete the game in under 1 hour.
Obtain the Hopper from Rebba.
Complete the game with 100% completion rate.