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