Besides gaining reputation with your questions and answers, you receive badges for being especially helpful. Badges appear on your profile page, flair, and your posts.

Question Badges

First bounty you manually awarded on another person's question
1 awarded
First bounty you manually awarded on your own question
8 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
45 awarded
First bounty you offered on another person's question
7 awarded
Question score of 10 or more
245 awarded
Asked a question with 1,000 views
130 awarded
First bounty you offered on your own question
12 awarded
Asked a question and accepted an answer
348 awarded
Asked first question with score of 1 or more
710 awarded
Asked a question with zero score, no answers, no comments, and low views for a week
123 awarded

Answer Badges

Edited and answered 1 question (both actions within 12 hours, answer score > 0)
15 awarded
Answer score of 10 or more
49 awarded
Answered more than 30 days later as first answer scoring 2 or more
56 awarded
Answered your own question with score of 3 or more
31 awarded
Answered first question with score of 1 or more
418 awarded

Participation Badges

Completed "About Me" section of user profile
10.7k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
Left 10 comments
126 awarded
Earned at least 200 reputation (the daily maximum) in a single day
7 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
One post with score of 2 on meta
Posted 10 messages, with 1 or more starred, in chat
8 awarded

Tag Badges

You must have a total score of 100 in at least 20 non-community wiki answers to achieve this badge.
10 awarded

Moderation Badges

First flagged post
191 awarded
First rollback
15 awarded
First down vote
121 awarded
Completed at least one review task. This badge is awarded once per review type
142 awarded
Deleted own post with score of 3 or higher
10 awarded
First edit
551 awarded
Edited first post that was inactive for 6 months
59 awarded
First retag
66 awarded
Deleted own post with score of -3 or lower
2 awarded
Approved or rejected 100 suggested edits
2 awarded
Used 30 votes in a day
12 awarded
First up vote
3k awarded
First approved tag synonym
4 awarded
First tag wiki edit
32 awarded
Used the maximum 40 votes in a day
8 awarded

Other Badges

Visited every section of the FAQ (retired)
157 awarded
Shared a link to a question that was visited by 25 unique IP addresses
35 awarded