Here is the full list of all 50 Ravenlok achievements worth 1,000 gamerscore. It takes around 4-5 hours to unlock all of the achievements on Xbox One.
Name your character
Pet your dog!
Dance for the first time
Speak with Finn in the Stone Garden
Sleep in the Witch's bed
Complete the game
Defeat the Weeping Fungi
Defeat Buvador the Bison
Defeat the Tweedle Twins
Defeat Ugsak the Glutton
Defeat Thorlaron the Hydra
Defeat Shani the Sorceress
Defeat the Woodlock Dodo
Defeat Eagleblade Prime
Defeat Flora Esmerelda
Defeat Yoth the Slayer
Defeat Dreda the Caterpillar Queen
Defeat the Harlequin ambush in the Mask Mansion
Meet the Queen in the Mushroom Forest
Activate the Planetarium in the Clock Tower
Get the first heart relic
Get the second heart relic
Get the third heart relic
Witness the Queen's abduction
Solve the Animal Puzzles in High Garden
Solve the Runestone Puzzle in the Labyrinth
Complete Bob the Frog's quiz
Complete Combat Training
Defeat Helios the Golden
Open the slimy chest!
Open the Hedgehog's shop
Speak with Alina the Crane at the Labyrinth entrance
Complete the 'Awaken the Spirits' quest
Complete the 'Shining Emblem' quest
Complete the 'Tea Sets' quest
Collect all 18 Figurines
Level up to level 10
Level up to level 20
Unlock 4 combat Skills
Unlock all Mirrors
Buy 20 bombs
Buy 30 potions
Wear the Masquerade Mask
Wear the Witch's Hat
Wear the Top Hat
Wear the Flower Crown
Wear the Queen's Crown
Enter the Old Barn
Enter the Queen's Chamber
Attend the final tea party