Yup, flashcards and spaced repitition are pretty well evidenced for memorisation. I’m also a fan of mind maps, but that’s more for linking ideas and concepts together, not just learning acronyms, but mixing the two works well.

There are other memorisation techniques that you might find helpful depending on how keen you are (visualisation, methods of loci, etc) but for most people they feel like to much trouble to learn. Creating mnemonics and associating stupid images and stuff with otherwise arbitary acronyms can help. I can still remember all my physics equations from high-school QIT PIV etc because of stupid nonsense phrases I associated with them.