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