Overcooked! All You Can Eat

This should come through natural progression. However, if in case you would like to unlock this now then there is a relatively fast and easy way to do this.

FYI - I highly suggest that you combine this with another achievement "Bangers and Trash" (for throwing 99 items in the trash).

Load up Overcooked! 2 since the first game does not have the throw ability.

Hit and choose "Practice" so you can have infinite time to do what you please in the kitchen.

Now, go to level 1-2 (the second level, really)

At the center of the kitchen is a box with rice in it. Grab that and toss it to the pots at the bottom. There are 3 pots that you can throw the raw rice into.

Immediately, head to the pots and pick one up and discard the rice into the trash which is conveniently located next to the pots. No need to pick up the other ones. All you have to do, with the pot in hand, is press over the other pots and the contents will transfer to your pot. Head over to the trash and discard that. Empty all 3 pots.

Rinse and repeat and soon Viola your achievement(s) is/are unlocked.

Happy hunting and Godspeed!