To get this you have to 100% the demo, which means getting all beer cans & dominating all levels.
Here's a video showing how to get all of them, I recommend trying the demo for yourself before watching, it's a good game.
Credit goes to JuicyLemonTv for the videoIn the video he doesn't show the level 11 beer can, hidden level with it's beer can aswell as the hidden beer can.
In level 11 close to the end you can see on the wall that the texture is different, it's a breakable wall. Hop in there and jump your way to the top and get the can!
In the hidden level it's above the platform you activate, just stand on it and it will rise to the can.
The hidden beer can is in the elevator picture, click the beer can in one of the screnshots