Here is the full list of all 19 LOVE achievements.
Get a B Rank or Better
Placed 250 Respawn Points
Beat the game on Normal or Better
Get a C Rank or Better
Took the higher path on Level 10.
Bounce 60 Times
Successfully take the Level 3 Shortcut without dying
You only live 999 times.
You only live once.
Climbed a Machine in India
Take the most efficient path through Level 2 without dying
Stay clean while making your way through Level 6
Took the lower path on Level 10.
Get an A Rank or Better
Get an A++ Rank
Beat the game in Speedrun Mode in under 12 Minutes
Submitted Speedrun Score to the Steam Leaderboards
Beat Level 8 without meeting an untimely demise.
Find the secret hidden in the depths of the Slow Tube