If achievements worked retroactively, meaning that if you had done is already, you would have the achievement automatically when it came out, which ones would you have that you currently do not?
For me: Capture a Lizard (I HAVE the freaking comatose lizard, still. xD) Vending Maniac! (20k) C-C-C-Combo Breaker! Mass Recycler (1k+) Scroll Maker Token Shop Regular (50) I'm serious. xD Only room for one Shinwa Helper (5+) Oracle Helper Malerias Little Helper! (100)
What about you?
Well for Maleria's quests I just need to do one to have the achievement updated. I got all her achievement tiers ages ago but today more came out.
So now it says for the 100 quests: 949/100
The ones I really reeeally wish were retroactive is merging legendaries. I would be somewhere between 5 and 10.
Our Lair is proof you don't have to stand face to face to know you've got friends who stand with you when you need us.
Mni wiconi -- water is life
oh so we can keep doing quests and perhaps they will count in future achievement uprades? that may inspire me to do them actually. lol
as for the OP, i suppose the oracle helper and scroll maker would definitely be two achievements i'd already have. ^_^

I would have this one:
Fishing Master Fish up the hidden treasure! 0/1

The maleria one was kind of retroactive to me. I was on 94/100 so that's 44 quests it had logged for me.
I would have Shinwa Helper and the Oracle ones. They're fairly easy though so they don't need to be retroactive.