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 award on another person's question
4 awarded
First bounty you manually award on your own question
8 awarded
Ask a well-received question on 5 separate days, and maintain a positive question record
40 awarded
First bounty you offer on another person's question
7 awarded
Question score of 10 or more
322 awarded
Question with 1,000 views
446 awarded
First bounty you offer on your own question
15 awarded
Ask a question and accept an answer
441 awarded
First question with score of 1 or more
973 awarded
Asked a question with zero score, no answers, no comments, and low views for a week
20 awarded

Answer Badges

Edit and answer 1 question (both actions within 12 hours, answer score > 0)
26 awarded
Answer score of 10 or more
395 awarded
Answer more than 30 days after a question was asked as first answer scoring 2 or more
66 awarded
Answer your own question with score of 3 or more
47 awarded
Answer a question with score of 1 or more
623 awarded

Participation Badges

Complete "About Me" section of user profile
2.2k awarded
Visit an election during any phase of an active election and have enough reputation to cast a vote
Leave 10 comments
84 awarded
Earn at least 200 reputation (the daily maximum) in a single day
12 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
42 awarded
One post with score of 2 on meta
59 awarded
Post 10 messages, with 1 or more starred, in chat
15 awarded

Tag Badges

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

Moderation Badges

First flagged post
139 awarded
First rollback
7 awarded
First down vote
105 awarded
Complete at least one review task. This badge is awarded once per review type
191 awarded
Delete own post with score of 3 or higher
4 awarded
First edit
388 awarded
Edit first post that was inactive for 6 months
45 awarded
First retag
55 awarded
Delete own post with score of -3 or lower
3 awarded
Approve or reject 100 suggested edits
3 awarded
Use 30 votes in a day
36 awarded
First up vote
1.3k awarded
First approved tag synonym
4 awarded
First tag wiki edit
26 awarded
Use the maximum 40 votes in a day
27 awarded

Other Badges

Visited every section of the FAQ (retired)
58 awarded
Share a link to a question later visited by 25 unique IP addresses
39 awarded
Read the entire tour page
382 awarded