Disney Pixar's Up is based on the charming movie of the same name. The good news is that unlike many other movie games, Up retains much of the charm of the film and, for co-op fans, allows players to play with a friend.
Make no mistake, this is a kids game. There is very little challenge, although sometimes the environments can create a bit of frustration in terms of camera angles. On the other hand, puzzles are easily solved since the game gives the player(s) hints as to how to proceed and which character needs to do what.
Although this is a kids game, it's also the kind of game that anyone can enjoy. The story is fun, and follows the film quite closely. If you enjoyed the film, you should enjoy the game as much.
As for the achievements, this is one of those games to rent for the 1k. It's easy to obtain all the achievements in one playthrough, and if you miss some collectibles, you can easily replay a level to pick them up. There are several excellent guides out there (some on this site) to help you find them.
As for replayability, kids may like the game enough to play over and over, but adults will probably have their fill in one sitting. As such, if you don't have kids, this is probably only a rental, although a delightful one that you'll likely enjoy.