Here is the full list of all 19 Monster Jaunt achievements.
Disable a minigame.
Play every minigame.
Finish a Full Game.
Finish a 50-turn Full Game.
In a Full Game, have one player score a monster every turn.
In Fish Bowling, have one player end with at least 20 points while only catching red fish.
Between four human players, score every orb in one game of Blasteroids.
In Lootenanny, win with at least 11,000G.
In Lumbersmack, get a score of 140 or higher.
Bake a 100-point Queasy Bake cake.
End a game of Below the Belt with three players having 0 points.
Win Pump Rumpus in under 45 seconds.
Win Peng-winners and Losers in under 70 seconds.
In a game of Zaptitude Test, defeat three CPU players without attacking.
In one game of Smartography, score at least 130 points between all human players.
In one game of Snowman is an Island, score at least 150 points between all human players.
In one game of Down for the Count, have all players get perfect scores without taking longer than 2 seconds to give each answer.
For one game of Halves and Halve-Nots, have one player choose the same plates as one CPU.
Survive for 5 minutes in Snoozy Smoothies.