Here is the full list of all 23 Grog achievements.
Come first in a game of Grog
Play with one friend
Play with two friends
Play with three friends
Come last in a game of Grog
Reach a tier 20 campsite in the camping minigame
Collect a total of 200 beer bottles in the beer collecting minigame
Mow a total of 2000 grass in the lawnmowing minigame
Swim in every water source on all maps
Complete a round of BBQ off without burning any meat
Win a game of Grog, beating 2nd place by at least 7000 points
Collect all secret beer bottles