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