Here is the full list of all 22 Pressure achievements.
Played 'Easy' Mode
Played game in co-op mode
Defeated Metal Count
Destroyed 8 enemies with one strike
Defeated 6 enemies with one strike
First checkpoint not accessed
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
Defeated 4 enemies with one strike
Barely finished with pressure…
Passed on primary weapon
Collected all coins
Destroyed all enemies
Never Died
Got best rating in all levels
Played the 'normal' way
Played 'Absurd' Mode