Out of Space: Couch Edition

A refrigerator can hold up 20 items including food, stunned aliens, boxes, and trash. To get this achievement, use a microwave to cook pumpkins and put 20 cooked pumpkins into the refrigerator.

You can unlock the fridge by earning which is completed by cooking 40 aliens in the Macrowave (thanks IBeTwitchen).

I earned this achievement when I found a refrigerator randomly in a level. As soon as I did, I switched my focus to cooking pumpkins.

Automating the process:

• Get a Chef Bot

• Get a Water Bot

• Put a macrowave in the same room with the pumpkins

• Install a bookshelf in the same room with the pumpkins

The chef bot will continually grab pumpkins, cook them, then put them in the refrigerator for you (though it may also put uncooked food in there, you mind need to check occasionally). The water bot will keep your pumpkins watered so you don't need to (though it will keep stealing your buckets). The bookshelf increases the pumpkin growing speed and macrowave cooking speed.