Here is the full list of all 45 The Body Changer achievements.
Activator used
Do a barrel roll
Clear first puzzle with the Nexus and the Ighel
First dummy takes the card
Kill the kebre
New Ray Color: BLUE
Defeat an enemy by making him falling into the Main Pool in Sector-02
Kill the Grott
Solve mirror puzzle in Sector-02
Use Dart energy ball to open a door
Pass the dark zone
Kill 10 worms on Filters Engine Area of Sector-03
Open door to Purifirer 02 from Sector-03
First puzzle with lasers
New Ray Color: GREEN
Kill 50 zombies in Turbine Area of sector-05
Find the granade launcher
Kill an enemy with the V-BLADE
Kill an enemy with the crack neck
Do a supplex to a green Kebre
Kill an enemy with a grenade
Trip an enemy with the machine gun
Trip an enemy with the gun
Kill an enemy with the green water
Kill 50 enemies with the V-BLADE
Kill 50 enemies with head shots
Kill an enemy with the energy ball
Kill a blue Kebre with the granade launcher
Stop an energy ball with a shoot
Kill 3 enemies with just one V-Blade stab
Activate the purifier-S01
Activate the purifier-S02
Activate the purifier-S03
Activate the purifier-S04
Enable the purifier-S05 Green Mode
Activate the purifier-S06
Enable the purifier-S07 Green Mode
Activate the purifier-S08
Activate the purifier-S09
Activate the purifier-S10
New Ray Color: YELLOW
Kill 6 Grott in Sector-10
Finish the game
Finish the game in very hard mode
Find all the d-Disks