Here is the full list of all 45 THE MULLER-POWELL PRINCIPLE achievements.
Meet the shadow
Get the Photon Gun
Find the transdimensional radio
Beat the prologue
Surrender to the mercs
Cut yourself in half by an isolation field
Blow up the reactor
Die from an EMP device
Arrive to the Forest dimension
Finish Dr. Walker’s experiment
Upgrade your Photon Gun
Try to swim away from the Lighthouse
Summon the Shepherd’s house
I’ve just been in this place before…
Blind the caged Stick with light
Charge an ancient Artifact using Shepherd’s device
Listen to all Shepherd’s recordings
Defeat the Shepherd
Touch the control panel in a non-dimension
Follow Alex’s plan and go to the Mushroom Kingdom
Refuse to go to the Mushroom Kingdom
Get the graviton boots
Jump from a cliff without graviton boots
Use graviton energy for the first time
Use a graviton generator to levitate
Hit the shadow with orange energy 3 times
Get to Harry’s office
Cause collapse of the Hotel dimension
Read through all of Harry’s conversations with Grace
Skip the colored rooms in the Hotel
Defeat Mason Powell
Get Eugene’s ending
Get Alex’s ending
Break The Muller-Powell Principle
Burn the Earth Kettle
Burn the cafeteria Kettle
Burn the reactor Kettle
Burn the shack Kettle
Burn the Ice World Kettle
Burn the abandoned Kettle
Melt the Mushroom Kettle
Burn the outpost Kettle
Blow up the storm Kettle
Burn Harry’s Kettle
Burn all the Kettles in the game