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