Here is the full list of all 12 Without my arms achievements.
You reached the first wiseman
You met Old Man Dan
You found Smegmy the Squirrel
You have met Sammy the Wisegirl
You have finished the game
You have seen all the endings
You have found all the easter eggs
You finished the game in under 5 minutes
You ate a pigeon
You killed 100 pigeons
You killed 1,000 pigeons
Beat the game faster than the game creator