Overcooked! 2

Best level for this achievement is 1-1 since the timer doesn't run. Fill up the first two guillotines with ingredients and proceed to smash the button constantly. No need to remove the ingredients. It will still count four chopped ingredients with every button press / guillotine drop.

I tested filling up all three guillotines which did not count progress, but leaving one empty seems to count. You'll only show progress on the achievement tracker when quitting the level, but you can still pop the achievement mid-level. Tested in both single player and co-op. Progress also counts for your co-op partner.

Took me about 10-15 minutes with this method.

Here is a link to a video guide for the achievement.

Best way is to finish the dlc then go back to level 1-1 and finish whatever chopping you have left in the game. As always the time on that level doesn't start until you serve your first meal so just keep loading up the guillotine, chop, remove what's there then rinse and repeat. The tracker doesn't update until you finish the level however it will pop in game as soon as you hit 500 chopped.

I personally put one chef at the button and just used the first 2 guillotines (out of pure laziness of not wanting the extra travel time) then just ran veggies with the other chef. After they were chopped I threw them outside the kitchen on each of the top corners to keep them from getting in my way.

Obviously how you do the chopping is all preference.