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