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Gamerscore: 20
Achievement Description: Win a skirmish or online match on every multiplayer map

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You have to beat all 20 maps in either skirmish or online. I suggest skirmish since you can add 2 cheating AIs to support you and finish the matches quite quickly without much effort.

2 Player Maps(5):
1. Clarke Training Center
2. Coalition Shipyard
3. Finns Revenge
4. Markon Bridge
5. Spring Duel

3 Player Maps(1):
6. Shiva Prime

4 Player Maps(14):
7. Artic Refuge
8. Boolon Complex (2vs2)
9. Boras Naval Test Range(2vs2)
10. Coalition Command Center(3vs1)
11. Corvana Chasm(2vs2)
12. Fields of Isis(2vs2)
13. Geothermal Borehole
14. Mirror Island(2vs2)
15. Open Palms(2vs2)
16. Setons Clutch(2vs2)
17. Sinorok Rift Armory(2vs2)
18. Treallach Island
19. Van Horne Core(2vs2)
20. Powderhorn Mesa