I don't want to be rude or something but did you actually try installing this pack?
If yes and it is really still somehow my mistake, I give you the exact list of steps I have tried the day I started this thread:
1. thought it was some cache, did remove the pack, reinstall it within twitch app
2. ok it did not help, tried completely remove the pack along with all of the files
3. no such luck, did reinstall twitch app, at this point it cannot be just cache
4. installed Feed the beast launcher to make sure it is not Twitch app related, seems it wasn't
5. looked up ftb.world if any run does actually use the pack with Epic_Bacon, turns out none of latest runs have version with that achievement, but those were month old, so I continued
6. tried installing everything manually, downloading from the official Curse webpage, these files contain only overrides for previous version of the pack
7. well, last step did not turn out too well, because I somehow screwed up copying overrides, so I wanted to check the Feed the Beast launcher source code to find out how to actually do that, but it was probably something silly, so instead I did try to install it on different machine and yet again, Harvestcraft still there
8. did also want to try to find the actual string "Harvestcraft" in decompiled jars to prove that I am not doing something wrong but they are probably obfuscated and it would also be easier to just to write in here and make people confirm this but it seems noone has this problem??
And here I am month and a half later trying to get my world record runs have finally be accepted, it really seems that I am the only one that still cares about this map.
*edit: the most recent run on ftb.world was accepted even though it clearly says "Harvestcraft". This run was performed exactly 25 days after my run that was submitted and denied.
*edit2: I should've done this way before, just quickly searched all files for keyword "Harvestcraft" and it seems, that all of the achievements are stored in json and it seems that "Epic_Bacon" is in there, but doesn't show up in game