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
13 awarded
First bounty you manually awarded on your own question
43 awarded
First bounty you offered on another person's question
32 awarded
Question score of 10 or more
1k awarded
Asked a question with 1,000 views
206 awarded
First bounty you offered on your own question
66 awarded
Asked a question and accepted an answer
476 awarded
Asked first question with score of 1 or more
1.1k awarded
Asked a question with no votes, no answers, no comments, and low views for a week
16 awarded

Answer Badges

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

Participation Badges

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

Tag Badges

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

Moderation Badges

First flagged post
144 awarded
First rollback
50 awarded
First down vote
272 awarded
Completed at least one review task. This badge is awarded once per review type
218 awarded
Deleted own post with score of 3 or higher
22 awarded
First edit
666 awarded
Edited first post that was inactive for 6 months
82 awarded
First retag
93 awarded
Deleted own post with score of -3 or lower
34 awarded
Approved or rejected 100 suggested edits
5 awarded
Used 30 votes in a day
47 awarded
First up vote
860 awarded
First approved tag synonym
10 awarded
First tag wiki edit
39 awarded
Used the maximum 40 votes in a day
27 awarded

Other Badges

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