Here is the full list of all 34 Marooners achievements.
Unlock the first character
Steal 10 coins from another player in any minigame.
Play a total of 5 local matches.
Play a total of 15 local matches.
Play a total of 50 local matches.
Play 3 online or friends matches.
Play 25 online or friends matches.
Play 100 online or friends matches.
Win 5 online or friends matches.
Win 15 online or friends matches.
Win 50 online or friends matches.
Be the last one standing in each of the minigames in a single match.
Stay alive for more than 2 minutes in a minigame.
Get a score over 100 in any minigame.
Get a score over 150 in any minigame.
Get a score over 200 in any minigame.
Get a total score over 300 in a match.
Get a total score over 450 in a match.
Get a total score over 600 in a match.
Unlock 10 weapons.
Steal 100 coins from another player in any minigame.
Get first blood in an online or friends match.
Pick up 10 powerups in any minigame.
Pickup 50 powerups in any minigame.
Pickup 100 powerups in any minigame.
Get the Pot of Gold in Flower Falls.
Get the Pot of Gold in Rocky Road.
Get the Pot of Gold in Stonework Square.
Get the Pot of Gold in Twin Temple.
Get the Pot of Gold in Mines of Mayhem.
Get the Pot of Gold in Icy Isles.
Collect a total of 1.000 points worth of coins, emeralds and diamonds.
Collect a total of 10.000 points worth of coins, emeralds and diamonds.
Collect a total of 50.000 points worth of coins, emeralds and diamonds.