Here is the full list of all 12 MegaGlest achievements.
Congratulations you won your first game
Congratulations you won your first Online game
You played 50 games
You played 100 games
You played 250 games
You played 500 games
You played more than 1000 games
50 network games
100 network games
250 network games
500 network games
More than 1000 network games