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