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
16 awarded
First bounty you manually award on your own question
21 awarded
Ask a well-received question on 5 separate days, and maintain a positive question record
82 awarded
First bounty you offer on another person's question
17 awarded
Question score of 10 or more
376 awarded
Question with 1,000 views
822 awarded
First bounty you offer on your own question
27 awarded
Ask a question and accept an answer
369 awarded
First question with score of 1 or more
742 awarded
Asked a question with zero score, no answers, no comments, and low views for a week
16 awarded

Answer Badges

Edit and answer 1 question (both actions within 12 hours, answer score > 0)
36 awarded
Answer score of 10 or more
325 awarded
Answer more than 30 days after a question was asked as first answer scoring 2 or more
207 awarded
Answer your own question with score of 3 or more
28 awarded
Answer a question with score of 1 or more
758 awarded

Participation Badges

Complete "About Me" section of user profile
1.9k awarded
Visit an election during any phase of an active election and have enough reputation to cast a vote
Leave 10 comments
180 awarded
Earn at least 200 reputation (the daily maximum) in a single day
20 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
35 awarded
One post with score of 2 on meta
90 awarded
Post 10 messages, with 1 or more starred, in chat
45 awarded

Tag Badges

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

Moderation Badges

First flagged post
131 awarded
First rollback
25 awarded
First down vote
184 awarded
Complete at least one review task. This badge is awarded once per review type
296 awarded
Delete own post with score of 3 or higher
9 awarded
First edit
662 awarded
Edit first post that was inactive for 6 months
43 awarded
First retag
54 awarded
Delete own post with score of -3 or lower
34 awarded
Approve or reject 100 suggested edits
4 awarded
Use 30 votes in a day
22 awarded
First up vote
995 awarded
First approved tag synonym
7 awarded
First tag wiki edit
15 awarded
Use the maximum 40 votes in a day
17 awarded

Other Badges

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