came back from a hiatus to see all sorts of mctweakery has happened to subeta. i tried the links to recover my achievements but i am pretty sure some are still missing. help?

also are there any like recent achievement guides?

No recent guides. If you check the achievement forum there are a few threads talking about specific new achievements. Also you may want to check the bug forum, right at the top, if I'm remembering right, there should be a stickied forum about achievements.