U can see your reward in your battle.net profile. This is mostly used in Blizzard maps for Achievements.
There are 4 kind of rewards atm:
- Decal
- Icon
- Model
- Portrait
Decal
- white symbols on units
Icon
- Standard Achievements, like http:sc2pod.com/achievements/
Model
- Special Model like Thor for Collected Edition
Portrait
- Battle.Net Profil Portrait
- Batt
