Does replaying missions in Starcraft II earn extra credits?
Solution 1:
You don't earn credits from repeating missions, but you can unlock achievements and earn research. Achievements unlock decals and avatars.
Reference:
- GameSpot Forums
Solution 2:
Currently I've finished all missions before going to Char and found that replaying some missions gives about 200k credits.
For instance, after replaying Breakout mission (I was out to get some unearned achievements) I've got credits when visited Research console.