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
First checkpoint not accessed
Passed on primary weapon
Never Died
Played the 'normal' way
Played 'Absurd' Mode
Defeated Metal Count
Played 'Easy' Mode
Fell off a bridge ten times
Defeated Wellness-Train
Defeated Mantis
Destroyed 8 enemies with one strike
Barely finished with pressure…
Destroyed all enemies
Collected all coins
Defeated 6 enemies with one strike
Got best buggy upgrade
Defeated 1000 enemies
Defeated an airship
Defeated 4 enemies with one strike