Well On A Scale Of 5(being the hardest)
I Would Give It A 2.
Fun game. Very easy and enjoyable, especially if you dug the movie. Not a hardcore game and definitely not that challenging. Sometimes repetitive but the story elements keep you going, particularly because the characters are so enjoyable and it's fun to revisit the world of WALL-E. Graphics are average, I give Wall-E a solid 4 stars on a 5-start scale, for being a fun kid's game that's tolerable and delivers on the promise of re-enacting your favorite moments from the film. Also, the achievements aren't painful.
So people say some of the achievemnts are glitchy(not sure on which ones)
but i have seen quite a few ppl with 1000/1000, so no need to worry.
i didnt get 1k in it, just casue i was getting annyoed with it, and their wasnt a guide out at the time to help you find everything you need to complete the game.