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.
First bounty you manually award on another person's question 535awarded First bounty you manually award on your own question 1.6kawarded Ask a well-received question on 5 separate days, and maintain a positive question record 5.3kawarded Ask a well-received question on 30 separate days, and maintain a positive question record 235awarded Ask a well-received question on 100 separate days, and maintain a positive question record 20awarded Question bookmarked by 25 users 2.1kawarded Question bookmarked by 100 users 295awarded First bounty you offer on another person's question 1.2kawarded Question score of 10 or more 20.9kawarded Question score of 25 or more 7kawarded Question score of 100 or more 1.2kawarded Question with 1,000 views 166.9kawarded Question with 2,500 views 96.7kawarded Question with 10,000 views 35.2kawarded First bounty you offer on your own question 3.8kawarded Ask a question and accept an answer 63kawarded First question with score of 1 or more 145kawarded
Answer Badges
First to answer and accepted with score of 10 or more 9.7kawarded Edit and answer 1 question (both actions within 12 hours, answer score > 0) 1.5kawarded Edit and answer 50 questions (both actions within 12 hours, answer score > 0) 61awarded Edit and answer 500 questions (both actions within 12 hours, answer score > 0) 1awarded Provide non-wiki answers of 15 total score in 20 of top 40 tags 104awarded Accepted answer and score of 40 or more 3.1kawarded Answer score of 5 or more to a question score of -2 or less that goes on to receive a score of 2 or more 115awarded Answer score of 20 or more to a question score of -3 or less that goes on to receive a score of 3 or more 11awarded Answer score of 10 or more 34kawarded Answer score of 25 or more 11.7kawarded Answer score of 100 or more 2kawarded Highest scoring answer that outscored an accepted answer with score of more than 10 by more than 2x 499awarded Answer more than 30 days after a question was asked as first answer scoring 2 or more 17.9kawarded Answer a question more than 60 days later with score of 5 or more 18.8kawarded Answer your own question with score of 3 or more 6.4kawarded Answer a question with score of 1 or more 89.6kawarded Zero score accepted answers: more than 5 and 20% of total 397awarded Zero score accepted answers: more than 10 and 25% of total 143awarded
Participation Badges
Complete "About Me" section of user profile 465.5kawarded Visit an election during any phase of an active election and have enough reputation to cast a vote 14.3kawarded Vote for a candidate in the final phase of an election5.8kawarded Leave 10 comments 21.5kawarded Leave 10 comments with score of 5 or more 181awarded Visit the site each day for 30 consecutive days. (Days are counted in UTC.) 2.4kawarded Visit the site each day for 100 consecutive days. (Days are counted in UTC.) 712awarded Earn at least 200 reputation (the daily maximum) in a single day 734awarded Earn 200 daily reputation 50 times 13awarded Earn 200 daily reputation 150 times 4awarded Followed the Area 51 proposal for this site before it entered the commitment phase 69awarded Voted 10 times, added 3 posts score > 0, and visited the site on 3 separate days during the private beta 83awarded One post with score of 2 on meta1.6kawarded 10 posts with score of 2 on meta145awarded Post 10 messages, with 1 or more starred, in chat546awarded Post 10 messages in chat starred by 10 different users 126awarded Active member for a year, earning at least 200 reputation 66.7kawarded
Tag Badges
You must have a total score of 100 in at least 20 non-community wiki answers to achieve this badge. 1.6kawarded You must have a total score of 400 in at least 80 non-community wiki answers to achieve this badge. 190awarded You must have a total score of 1000 in at least 200 non-community wiki answers to achieve this badge. 45awarded
Moderation Badges
First flagged post 8.9kawarded Raise 80 helpful flags 610awarded Raise 500 helpful flags 200awarded Vote 300 or more times 1.3kawarded First rollback 1.4kawarded Served as a pro-tem moderator for at least 1 year or through site graduation 4awarded Served as an elected moderator for at least 1 year 16awarded First down vote 10.9kawarded Complete at least one review task. This badge is awarded once per review type 19.7kawarded Complete at least 250 review tasks. This badge is awarded once per review type 931awarded Complete at least 1,000 review tasks. This badge is awarded multiple times per review type 978awarded Delete own post with score of 3 or higher 324awarded First edit 118.7kawarded Edit 80 posts 426awarded Edit 500 posts (excluding own or deleted posts and tag edits) 138awarded Vote on 600 questions and 25% or more of total votes are on questions 271awarded Edit first post that was inactive for 6 months 8.5kawarded Edit 100 posts that were inactive for 6 months 78awarded First retag 3.4kawarded Delete own post with score of -3 or lower 1.3kawarded Approve or reject 100 suggested edits 290awarded Up vote 100 answers on questions where an answer of yours has a positive score 55awarded Use 30 votes in a day 1kawarded First up vote 161.1kawarded First approved tag synonym53awarded First tag wiki edit 591awarded Edit 50 tag wikis 14awarded Create a tag used by 50 questions 546awarded Use the maximum 40 votes in a day 702awarded
Other Badges
Share a link to a post later visited by 25 unique IP addresses 9.1kawarded Share a link to a post later visited by 300 unique IP addresses 1.4kawarded Share a link to a post later visited by 1000 unique IP addresses 418awarded Completed the annual Stack Overflow survey; your responses are anonymous 407awarded Read the entire tour page 95.5kawarded
Retired Badges
Visited every section of the FAQ 1.1kawarded Provide an answer of +20 score to a question of -5 score 4awarded Asked a question with zero score, no answers, no comments, and low views for a week 50.9kawarded
Matthew Martinez 
