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