How is it I can get the 10 map achievement despite only winning 8 games?

Map 1
http://warlight.net/MultiPlayer?GameID=4618793 (a nice farm attempt that backfired quickly)
Map 2 (3 victories on this map)
http://warlight.net/MultiPlayer?GameID=4613848
Map 3
http://warlight.net/MultiPlayer?GameID=4607517
Map 4 (2 victories on this map)
http://warlight.net/MultiPlayer?GameID=4607685
Map 5
http://warlight.net/MultiPlayer?GameID=4608735

Does having different settings on the same map count twice? (wastelands vs no wastelands?)
Do single-player games qualify here? (the first 4 and tutorial?)

I think by playing a few maps, you 'triggered' the achievement, meaning you did it before. If you see my profile, you'll notice I've won on 100 maps. I definitely didn't do this after 2.0 was released.

meaning you did it before

look in his profile, he has only 8 games won

I guess single player counts

I'm pretty sure the maps achievement includes single player and practice games.

different map versions: if map a has 4 versions, a win on any version of the map counts as having won on 4 diferent maps (1 win counted 4 times)?

i dont play single player. my practice games are on maps i already won on. i won on about 60 maps. those maps have multiple versions that probably add up to more than 100. but it says i won on 100 maps.