Here is the full list of all 45 The Body Changer achievements.
Activator used
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
Do a barrel roll
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