Here is the full list of all 18 Armikrog achievements worth 1,000 gamerscore. It takes around 2-3 hours to unlock all of the achievements on Xbox One.
Watch all of the Mongrel window movies
Find P
Activate/enter the first Zipkicker
Solve the puzzle in the Scaley Room
Solve 5 Puzzles
Read all of the stories in Hall of Heroes (click each of the 8 panels)
Solve the JeffersAnt Puzzle (give him the feather)
Use Beak Beak to discover the Hall of Heroes Names
Use all Father Statues
Solve the Robot Puzzle
Solve 10 Puzzles
Collect all P-tonium Pieces from P
Pull lever to activate language translations
Start All 4 Engines
Solve the console puzzle in Emerald Room
Beat the Game
Find the Hot Rod Zipkicker
Beat the Game having solved all puzzles and find Hot Rod Zipkicker