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