Quote:
Originally Posted by chryuop
It is used to show an action that is completed, no further room to carry the action on more than that.
牛乳をこぼしてしまった
牛乳をこぼしちゃった (colloquial).
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Your explanation and your example sentence don't match unfortunately.
The explanation is good for OP's sentence 「宿題はもうやってしまった。」. = 100% finished
The appropriate explanation for 「牛乳をこぼしてしまった。」 is that
the action was not deliberate.