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