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