Alright! Here is the list of known achievements:
[*] Chatterbox level 1: Comment 10 times
[*] Chatterbox level 2: Comment 20 times
[*] Chatterbox level 3: Comment 30 times
[*] First like: Like something [*] My 2 cents: Review 2 sets
[*] The critic: Review 10 sets [*] Satisfied customer: Give a set 5/5
[*] Early adopter: Be the first to review a set
[*] Treasure hunter: Unknown
[*] Take my money: Unknown
[*] Window shopper: Unknown
This is by no means a complete list and should not be considered one! So please mention here when you get an achievement and what you think you must do to get it!