Here is the full list of all 26 Unravel achievements worth 1,000 gamerscore. It takes around 12-15 hours to unlock all of the achievements on Xbox One.
Mended a broken bond
Successfully lassoed between 25 different attach points without touching the ground
Found the other broken half piece
Found a broken half piece
Found the eighth missing piece
Found the seventh missing piece
Retrieved the stolen piece
Found the collectible in the crushing, zapping death machine
Found the sixth missing piece
Found the fifth missing piece
Made it to the water wheel without using a log raft
Found the fourth missing piece
Found the secret in the maze section
Found the third missing piece
Found the second missing piece
Found the first missing piece
Collect all Achievements
Find every secret
Finish each level from start to finish without dying
Tear down all the thistles in one go
Find the secret hidden in the tree tops where you fly
Make it through the mire in one go without swatting any mosquitoes
Use the excavator to find a secret
Break all the ice on the way to the letterbox in one go
Clear all the snowy branches in one go
Find the secret in the engine room