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
36 awarded
First bounty you manually awarded on your own question
56 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
113 awarded
First bounty you offered on another person's question
40 awarded
Question score of 10 or more
1.2k awarded
Asked a question with 1,000 views
1.6k awarded
First bounty you offered on your own question
65 awarded
Asked a question and accepted an answer
747 awarded
Asked first question with score of 1 or more
1.4k awarded
Asked a question with no votes, no answers, no comments, and low views for a week
10 awarded

Answer Badges

Edited and answered 1 question (both actions within 12 hours, answer score > 0)
88 awarded
Answer score of 10 or more
1.5k awarded
Answered more than 30 days later as first answer scoring 2 or more
118 awarded
Answered your own question with score of 3 or more
50 awarded
Answered first question with score of 1 or more
2k awarded

Participation Badges

Completed "About Me" section of user profile
3.2k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
346 awarded
Left 10 comments
584 awarded
Earned at least 200 reputation (the daily maximum) in a single day
64 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
44 awarded
One post with score of 2 on meta
237 awarded
Posted 10 messages, with 1 or more starred, in chat
124 awarded

Tag Badges

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

Moderation Badges

First flagged post
371 awarded
First rollback
79 awarded
First down vote
521 awarded
Completed at least one review task. This badge is awarded once per review type
435 awarded
Deleted own post with score of 3 or higher
28 awarded
First edit
1.5k awarded
Edited first post that was inactive for 6 months
102 awarded
First retag
142 awarded
Deleted own post with score of -3 or lower
76 awarded
Approved or rejected 100 suggested edits
12 awarded
Used 30 votes in a day
80 awarded
First up vote
2.2k awarded
First approved tag synonym
13 awarded
First tag wiki edit
72 awarded
Used the maximum 40 votes in a day
52 awarded

Other Badges

Visited every section of the FAQ (retired)
107 awarded
Shared a link to a question that was visited by 25 unique IP addresses
24 awarded
Read the entire tour page
703 awarded