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
9 awarded
First bounty you manually awarded on your own question
23 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
138 awarded
First bounty you offered on another person's question
11 awarded
Question score of 10 or more
622 awarded
Asked a question with 1,000 views
319 awarded
First bounty you offered on your own question
24 awarded
Asked a question and accepted an answer
703 awarded
Asked first question with score of 1 or more
1k awarded
Asked a question with no votes, no answers, no comments, and low views for a week

Answer Badges

Answer score of 10 or more
651 awarded
Answered more than 30 days later as first answer scoring 2 or more
78 awarded
Answered your own question with score of 3 or more
28 awarded
Answered first question with score of 1 or more
679 awarded

Participation Badges

Completed all user profile fields
939 awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
Left 10 comments
240 awarded
Earned at least 200 reputation (the daily maximum) in a single day
45 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
39 awarded
One post with score of 2 on meta
141 awarded
Posted 10 messages, with 1 or more starred, in chat
47 awarded

Tag Badges

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

Moderation Badges

First flagged post
98 awarded
First rollback
32 awarded
First down vote
182 awarded
Completed at least one review task. This badge is awarded once per review type
239 awarded
Deleted own post with score of 3 or higher
12 awarded
First edit
610 awarded
Edited first post that was inactive for 6 months
42 awarded
First retag
78 awarded
Deleted own post with score of -3 or lower
21 awarded
Approved or rejected 100 suggested edits
1 awarded
Used 30 votes in a day
40 awarded
First up vote
1.2k awarded
First approved tag synonym
7 awarded
First tag wiki edit
34 awarded
Used the maximum 40 votes in a day
27 awarded

Other Badges

Visited every section of the FAQ (retired)
71 awarded
Shared a link to a question that was visited by 25 unique IP addresses
11 awarded
Read the entire about page
233 awarded