Here is the full list of all 22 Pressure achievements.
Passed on primary weapon
Collected all coins
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
Played 'Easy' Mode
Played the 'normal' way
Played 'Absurd' Mode
Defeated Wellness-Train
Played game in co-op mode
Defeated Metal Count
Defeated 6 enemies with one strike
Destroyed 8 enemies with one strike
Defeated 1000 enemies
Defeated Mantis
Barely finished with pressure…
Defeated an airship
Defeated 4 enemies with one strike