Use Quick Reply instead of normal reply. It's the little arrow beside "Reply" for anyone that hadn't noticed.
This way there's less pages to load, and you rarely get asked to fill out a captcha for posting too much.
Now just copy and paste this into it and recieve your squishy colourful grunny clones:
[quote="[NPC] Easter Bunny"][/quote]
If you already knew that, brilliant! If not, you're welcome; I've just saved you a few seconds per Diedrich. cool
Maybe you'll do something useful with the extra minutes of life you have just been granted! Probably not.
EDIT: So you guys are having trouble finding Lavender Diedrichs?
Open the event home page in about five tabs. A quick way to do this is middle-click the link by pressing in the scrollwheel, if you have one. Close each tab until you find a Diedrich, and repeat. You'll get tons of Blue/Pink/Lavender very fast this way. Hopefully I've just saved you even more time.
Edit 2: Well this makes me sad.
I have collected well over 1000 Diedrichs and still no third achievement.
Edit 3: Got it after the event ended somehow.
Now get the heck outta this thread now there's no reason for you to still be here, the grunnys are gone. D:<