Here is the full list of all 29 Last Shark Standing achievements.
Win a match against 3 bots on normal difficulty or harder without losing a round
Win a match against 3 bots on hard difficulty without losing a round
Win a tournament against 3 bots on normal difficulty or harder
Win a tournament against 3 bots on hard difficulty
Win a super tournament against 3 bots on normal difficulty
Win a super tournament against 3 bots on hard difficulty
Win a tournament against 3 bots without losing a match
Hit an opponent 50 times with an anchor
Hit an opponent 50 times with a harpoon
Hit an opponent 50 times with a bubble
Hit an opponent 50 times with a boomerang
Hit an opponent 50 times with a dynamite
Hit an opponent 50 times with an implosion orb
Hit an opponent 50 times with a disc
Win a match on the Beach level as a lifeguard shark
Win a match on the Pirate ship level as a pirate shark
Win a match on the Castle level as a knight shark
Win a match on the Volcano level as a tribal shark
Win a match on the Space station level as an astronaut shark
Win a match on the Temple level as an archaeologist shark
Pick up every powerup
Get hit by every hazard
Get hit by a boulder in the Temple level as the archaeologist shark
Get hit by the barrage in the Castle level as the knight shark
Get hit by a wave in the Beach level as the lifeguard shark
Get hit by a cannon in the Pirate ship level as the pirate shark
Get sucked out of the Space station as the astronaut shark
Be the first to get eliminated in the Volcano level as the tribal shark
Using the fishing pole, hook an opponent that’s airborne