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