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