Here is the full list of all 15 Goblin Storm achievements.
Goblin Storm Beta Tester
Win a game as a human faction
Win a game as a goblin faction
Win a game in single player
Win a game against a human opponent
Win a game in coop
Have a game end in a draw
NS 2 Games Developer
Play a game with an NS 2 Games developer
Win 10 games while playing Humans
Win 10 games while playing Goblins
Win 100 games while playing Humans
Win 100 games while playing Goblins