Here is the full list of all 26 LOVE 2: kuso achievements.
In Level Select Mode, beat a level in under 10 seconds.
Complete kuso Level 25 without using any respawn points
Get two A's in any category of your results.
Perform a smooth maneuver on kuso Level 2
Fall for two minutes straight.
Take the upper path on kuso Level 18
Get an A in any category of your results
Complete LOVE+kuso
Climb kuso Level 22 without using safety ledges
In Level Select Mode, beat a level without jumping.
Complete kuso on either Arcade or Hard Mode
Complete LOVE
In dedication not just to Charlie, but to you.
Collect all five Charlie tokens in one playthrough of kuso
Complete kuso while having collected all 8 Extra Lives
Complete kuso in under 15 minutes on any difficulty
Complete kuso in Speedrun Mode with 100% Completion
Complete LOVE+kuso 100% in Speedrun Mode
Complete LOVE+kuso in under 30 minutes
In Level Select Mode, beat the Credits in under 01:15
Collect 49 YOLO Medals