Here is the full list of all 22 Rift Racoon achievements.
Complete the first world, Testing Grounds
Complete the second world, Green Plateaus
Complete the third world, Molten Caves
Complete the fourth world, Rift Labs
Break 100 potions
Interact with 100 dandelions in the Green Plateaus
Crush 50 rocks in the Molten Caves
Knock 50 wet floor signs in the Rift Labs
Collect 5 diamonds
Collect 10 diamonds
Collect 15 diamonds
Collect 20 diamonds
Collect 25 diamonds
Collect 30 diamonds
Collect 35 diamonds
Collect 40 diamonds
Collect 45 diamonds
Collect all 50 diamonds
Complete the game on Casual difficulty
Complete the game on Normal difficulty
Complete the game on Hard difficulty
You interacted with the lone dandelion, hidden in the Green Plateaus