Help with custom achievement system (datastore)

[acoustic osprey]

So I've got the achievements, animations, UI, and everything ready... How can I make it so when a player gets an achievement, it's added to a table, and next time they can't get it again because they already have it? I know I need to use DataStores, but I'd really appreciate a code example.

[ornate nova]

Use profile thingy method

I forgot what it called

[acoustic osprey]

?

[graceful wing]

you can just use badges for that