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
33 awarded
First bounty you manually award on your own question
160 awarded
Ask a good question on 5 separate days, and maintain a positive question record
399 awarded
First bounty you offer on another person's question
78 awarded
Question score of 10 or more
1.1k awarded
Question with 1,000 views
11.2k awarded
First bounty you offer on your own question
416 awarded
Ask a question and accept an answer
5.2k awarded
First question with score of 1 or more
11.3k awarded
Asked a question with zero score, no answers, no comments, and low views for a week
3.7k awarded

Answer Badges

Edit and answer 1 question (both actions within 12 hours, answer score > 0)
124 awarded
Answer score of 10 or more
1k awarded
Answer more than 30 days after a question was asked as first answer scoring 2 or more
995 awarded
Answer your own question with score of 3 or more
365 awarded
Answer a question with score of 1 or more
7k awarded

Participation Badges

Complete "About Me" section of user profile
22.4k awarded
Visit an election during any phase of an active election and have enough reputation to cast a vote
395 awarded
Leave 10 comments
1.1k awarded
Earn at least 200 reputation (the daily maximum) in a single day
33 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
87 awarded
One post with score of 2 on meta
226 awarded
Post 10 messages, with 1 or more starred, in chat
39 awarded

Tag Badges

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

Moderation Badges

First flagged post
1.2k awarded
First rollback
70 awarded
First down vote
887 awarded
Complete at least one review task. This badge is awarded once per review type
892 awarded
Delete own post with score of 3 or higher
20 awarded
First edit
6.7k awarded
Edit first post that was inactive for 6 months
312 awarded
First retag
385 awarded
Delete own post with score of -3 or lower
65 awarded
Approve or reject 100 suggested edits
24 awarded
Use 30 votes in a day
120 awarded
First up vote
12.4k awarded
First approved tag synonym
10 awarded
First tag wiki edit
119 awarded
Use the maximum 40 votes in a day
85 awarded

Other Badges

Visited every section of the FAQ (retired)
349 awarded
Share a link to a question later visited by 25 unique IP addresses
382 awarded
Read the entire tour page
3.8k awarded
http://android.stackexchange.com/help/badges?tab=general&filter=bronze
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