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