Feeding Frenzy

At the title screen you have a number of options. Choose adventure. Eddie's levels are levels 17-24 of the game. Complete them and you'll net yourself the achievement. If you die during this process and run out of continues (somehow...) you can return to the level you last completed and continue from there, with your score reset. The achievement will still unlock though after the completion of the levels, despite how many tries it takes you.

Beat the first 24 levels of the game. You will get Eddie on level 17

To get this achievement all you need to do is complete the levels 17 through to 24 and you will snag your self the acheivement.