What is an antonym for achieve?

Here are some antonyms for "achieve", depending on the context:

General Antonyms:

* Fail

* Miss

* Neglect

* Abandon

* Forsake

More Specific Antonyms:

* Lose (for a competition or goal)

* Destroy (for a positive accomplishment)

* Undermine (for a positive effect)

* Deter (for a positive outcome)

* Prevent (for a positive result)

The best antonym will depend on the specific meaning of "achieve" in the context of your sentence.