Here is the full list of all 22 Pressure achievements.
Never Died
Played game in co-op mode
Helped out a friend
Destroyed all enemies
Got best rating in all levels
Played the 'normal' way
Played 'Absurd' Mode
Defeated Metal Count
Played 'Easy' Mode
Got best buggy upgrade
Defeated Wellness-Train
Defeated Mantis
Defeated an airship
Destroyed 8 enemies with one strike
Defeated 1000 enemies
Fell off a bridge ten times
Barely finished with pressure…
Defeated 6 enemies with one strike
Passed on primary weapon
Defeated 4 enemies with one strike
Collected all coins
First checkpoint not accessed