The 20,000 points one shouldn't even take too long - there's 400 points on the team with 100 x 4 Worms, so it's only 50 matches if you have 2 teams in the match, if you did it with 4 teams you could do it in 17 games. People will probably even plug in their second pads (and third and fourth if they have them) and get these in no time by grouping all of the "dummy" team's worms together and then concentrating their attacks on the area they are all in. By doing that you could also get the three bagger, body count and shepherd achievements as well as the gold, silver and bronze damage ones, giving you 110 points without even trying.
I won't be doing that, but I'm sure others who are actually bothered about their gamerscore will. Looking at the achievements, this could be the first XBLA game that I get all 200 points for which is another reason I won't boost how I described above, if I'm going to get all 200 I'd rather get them all properly. Most of the achievements you're guaranteed to get eventually if you keep playing, and I can see me playing this for a very long time!
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