Here is the full list of all 24 Pressure Overdrive achievements.
Defeated 100 enemies through ramming.
Finished 20 levels in Endless mode.
Finished a level with a fully upgraded Teslagun and Tesla secondary.
Finished a level without taking any damage.
Finished a level with a buggy at maxed-out pressure capacity.
Finished a level with the buggy at maxed-out hull.
Didn't touch the ground for 15 seconds.
Finished the campaign on Easy difficulty.
Finished the campaign on Normal difficulty.
Defeated the Underground Boss in Level 33.
Defeated the Castle Boss in Level 22.
Defeated 1000 enemies.
Defeat the Riverbed Boss in Level 11.
Defeated 5 enemies with one strike.
Let a Sucker suck at least 10 pressure pills before destroying it.
Brought 5 love-touched enemies to the finish line.
Finish a level without driving on 'low pressure'.
Got in love touch with 10 enemies.
Had a Spatank drag the buggy with a grappling hook for 30 seconds.
Defeated 18 enemies while a powerup was active.
Finished 10 Hornets with the railgun without missing once.
Finished a level with having activated underbody or rear explosives for 20 times.
Defeated all enemies in a level (Tutorial excluded).
Finished the campaign on Hard difficulty.