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
3 awarded
First bounty you manually awarded on your own question
18 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
97 awarded
First bounty you offered on another person's question
9 awarded
Question score of 10 or more
238 awarded
Asked a question with 1,000 views
526 awarded
First bounty you offered on your own question
37 awarded
Asked a question and accepted an answer
1.6k awarded
Asked first question with score of 1 or more
2.6k awarded
Asked a question with no votes, no answers, no comments, and low views for a week
51 awarded

Answer Badges

Edited and answered 1 question (both actions within 12 hours, answer score > 0)
44 awarded
Answer score of 10 or more
440 awarded
Answered more than 30 days later as first answer scoring 2 or more
108 awarded
Answered your own question with score of 3 or more
32 awarded
Answered first question with score of 1 or more
890 awarded

Participation Badges

Completed "About Me" section of user profile
4.6k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
Left 10 comments
323 awarded
Earned at least 200 reputation (the daily maximum) in a single day
7 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
48 awarded
One post with score of 2 on meta
95 awarded
Posted 10 messages, with 1 or more starred, in chat
22 awarded

Tag Badges

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

Moderation Badges

First flagged post
199 awarded
First rollback
20 awarded
First down vote
194 awarded
Completed at least one review task. This badge is awarded once per review type
347 awarded
Deleted own post with score of 3 or higher
11 awarded
First edit
1.4k awarded
Edited first post that was inactive for 6 months
70 awarded
First retag
81 awarded
Deleted own post with score of -3 or lower
22 awarded
Approved or rejected 100 suggested edits
10 awarded
Used 30 votes in a day
23 awarded
First up vote
3.1k awarded
First approved tag synonym
7 awarded
First tag wiki edit
36 awarded
Used the maximum 40 votes in a day
14 awarded

Other Badges

Visited every section of the FAQ (retired)
99 awarded
Shared a link to a question that was visited by 25 unique IP addresses
38 awarded
Read the entire tour page
412 awarded
http://crypto.stackexchange.com/help/badges?tab=general&filter=bronze
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