Ich behalte mir alles.

English: I remember everything.
I asked a native and Germans would translate to “Ich behalte alles” instead of
“ich behalte mir alles”. Apparently the mir here is komisch.

It’s not the most common phrase (rather dying out) and it is strictly colloquial. But it’s not wrong.
ich behalte mir alles - to remember something
ich behalte alles - to keep something (physical)

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