I didn't see a thread keeping track of all of these... If you have suggestions, feel free to post them here and I can add them to this post. Some of these are my suggestions, some I've seen others post in various locations, whether a news comment or a forum topic. I'm including forum titles suggestions if there are any.
Decanter Scientist (currently goes to 5k)
Holiday Helper (currently goes to 250)
Scratcher (currently goes to 5k)
High Rarity Grabber (currently goes to 25)
Restocker (currently goes to 25k)
Sticky! (currently goes to 1k)
Green Thumb (currently goes to 10)
Autoprice (currently at 1) "Merchant of Venice [user]"
Have Friends (currently goes to 50) "[user] is so super friendly!" or "So friendly [user] it's magic"
Forum Title Collector (currently none) "You can call [user] Betty" or "[user] is a social climber"
Random Champion (currently at 1)
Go Fishing (currently at 1)
Safe Cracker (currently at 1)
Item Scramble Challenge (currently at 1)
Item Scramble Pro (currently at 1)
Krypts Explorer (currently at 1)
Quests
Assistant Chef (currently at 3k)
Battle Royale (currently at 5k), ideally with Potion of Loyalty at 1k tiers
Drunk Carl (currently at 2k)
Graveyard Shift (currently at 2k)
Librarian (currently at 2k)
Major Drills (currently at 2k)
Malerias Little Helper (currently at 3k)
Saggitarius Fan (currently at 3k)
Sarah Quest Completion (currently at 150)
Split Personality: Mori (currently at 1.5k)
Split Personality: Nori (currently at 1.5k)
Toying with Cinthia (currently at 2k)
Wizard Employee (currently at 3k)
We've had confirmation from staff that the following are in the works for achievements/more tiers: Consecutive bathhouse visits Book Worm Baking at Fantine's Bakery
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Ooh, thank you for making this thread ! You should add the gardening to your list (a great suggestion from a user in the recent news posts for tiers)!
Done! Thanks for pointing that out :).
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Autoprice 180/360 merchant of venice user Make a Friend 5/10/25 user is so super friendly! 100 So friendly user it's magic Forum Title Collector 5/10/25 You can call user Betty 50 user is a social climber
Maybe more tiers in random for hitting 10k or more?
More fishing tiers? We only have one for just going fishing and I am sure there can be neat titles added and will get people playing it more often.
More tiers if there can be some added for cracking the safe?
Throwing my support for Green Thumb and High Rarity Grabber, and suggesting Item Scramble Challenge, Item Scramble Pro and Krypts Explorer Also wouldn't mind seeing titles added to already existing tiers.
Definately yes to all of those suggested already, especially scratcher, high rarity grabber and restocker.
I would also like to see higher tiers to the quest tiers (they go up to 3000)
And last but not least: the Battle Royale tiers (for doing battle quests). It only goes up to 5000 and I have completed it ages ago. Some new tiers would be much appreciated (especially if the potion of loyalty is also awarded at for example 5000/6000/7000 quests, that would help motivation!)
[img align=right]http://i1099.photobucket.com/albums/g382/Rivvie/mieukleiner.jpg[/img]
I'd love to see more tiers for Cumulative Pet Treasure! It only goes up to 1k. It would be nice to finally get a title for that achievement too.

Thanks for the suggestions, everyone! I updated the first post.
There already is a "Have Friends" achievement up to 50 - but I added your suggestion for pushing it to 100.
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Not sure if this is possible with fishing, but you do get different results based on how close you are. In addition to just tiers for fishing over and over again, there should be tiers for "how did you get so far away from the treasure" "you were so close" "if only you were a little closer" and "you were nowhere near it"
This is maybe... a little too picky on my end but since we get the same kind of activities with each holiday, I think they should all have around the same tiers? Right now they're a little all over the place --
a list
survival
kiss a user / 1750
someone likes you! (get a kiss) / 1500
leave a flower / 1500
masq can i have this dance / 2500
vesnali flower finder / 1000 flower recipient / 100 good friend (give flowers) / 500
morostide pumpkin finder / 1000 carve a pumpkin / 500 delete a pumpkin / 1000 pumpkin patch visitor / 100 TP houses / 100 get tp'd / 100 trick or treat! / 250
fireside charitable (give to charity) / 1000 fantine pies (give to fantine) / 750 capture a floating rreign / 500 item giver (give to red rreign) / 1000 burned / 100
lumi fairy catcher / 500 free all the fairies / 1000 The disparity between the get-flowers achievement and the give-flowers achievement is what got me. Maybe the activity-related ones (trick or treat, kissing, giving flowers) could even out at 2000, and the floating-item ones (both finding the thing and doing whatever with it - donating a pumpkin to fantine or releasing a fairy or whatever) at a 1000? I know it's a big jump for some of them, but "can I have this dance" would still be the highest at 2500 and we've got precedence for crazy tiers with that snowball achievement, so idk. also this is not the correct topic for this but now I'm wondering why there's only a request-dances achievement, and not an accept-dances one p:
I don't think they all need to be at the same area because some things are a little easier (depending on times etc). But yeah, I'll likely increase some of these going on for holidays :)
ALSO SNOWBALLS AREN'T CRAZY YOU CAN DO THEM FOR LIKE THREE MONTHS IT'S OKAY
Ok I'm not a fan of tiers, but some are necessary and I can vote yes for them but some are not.
In my opinion:
quests - we have enough.
Friends - it's just awkward and weird to add people and then delete them (with their knowledge of it of course),...
TC - also no, 1k is more than enough..
I'm just saying that it should be reasonable and to the right and needed achievements.
I rather see new achievements with tiers than recycling old ones with new crazy tiers...
I'm not saying we're going to be adding tiers to all the things suggested here, like I'm not going to add to the friend one (for the reason you posted basically). Some things are getting tiers because it makes people go back and do those things (maps, more TS, garden, etc). :)
i figured hiking them up so far was a bit much but i like things to be even :y my main sticking point was the vesnali ones being pretty low; i almost didn't want to post since i figured those were probably already on your list.
and i know, i didn't mean crazy in a bad way! i just love how ridiculous it is as like, a to-do list task - inflict fiFTY THOUUUSAND VIRTUAL SNOWBALLS UPON THE POPULOUS... to win a book about gingerbread men p:
it's so you spend your winters with us AND NEVER LEAVE (just throwing snowballs forever)
ok let's make a deal, tiers for my natasha suggestion? xD
joking, but I really want to see more new, I can work with you on them I have so many fun ideas and less evil and trolly :P
And please add battle achievements with tiers, it's so neglected and we have so many challengers.. even meta ones for like beating all the easy, medium, all the cs monthly of x year etc..