Here is the full list of all 79 Fire Shark achievements.
You have achieved your first of many losses to come
Play a hundred games
Get terminated a thousand times
Fire one million bullets of any kind
Upgrade your weapons one time
Upgrade your weapons a thousand times
Upgrade your weapon to the max
Turn the first boss in the game into dust in the 1P version
Crush the spirit of life out of the second boss in the 1P version
Return the third boss to its maker in the 1P version
Put the fourth boss six feet under in the 1P version
Bring an end to the fifth boss in the 1P version
Bring down the sixth boss in the 1P version
Crush the seventh boss in the 1P version
End the eighth boss in the 1P version
Bring in the termination of the ninth boss in the 1P version
Slaughter the final boss in the 1P version
Eliminate the first boss without assistance in the 1P version
Eliminate the second boss without assistance in the 1P version
Eliminate the third boss without assistance in the 1P version
Eliminate the fourth boss without assistance in the 1P version
Eliminate the fifth boss without assistance in the 1P version
Eliminate the sixth boss without assistance in the 1P version
Eliminate the seventh boss without assistance in the 1P version
Eliminate the eighth boss without assistance in the 1P version
Eliminate the ninth boss without assistance in the 1P version
Eliminate the tenth boss without assistance in the 1P version
Turn the first boss in the game into dust in co-op
Crush the spirit of life out of the second boss in co-op
Return the third boss to its maker in co-op
Put the fourth boss six feet under in co-op
Bring an end to the fifth boss in co-op
Bring down the sixth boss in co-op
Crush the seventh boss in co-op
End the eighth boss in co-op
Bring in the termination of the ninth boss in co-op
Slaughter the final boss in co-op
Eliminate the first boss without assistance in co-op
Eliminate the second boss without assistance in co-op
Eliminate the third boss without assistance in co-op
Eliminate the fourth boss without assistance in co-op
Eliminate the fifth boss without assistance in co-op
Eliminate the sixth boss without assistance in co-op
Eliminate the seventh boss without assistance in co-op
Eliminate the eighth boss without assistance in co-op
Eliminate the ninth boss without assistance in co-op
Eliminate the tenth boss without assistance in co-op
Complete the game using only one credit in 1P
Complete the game using only one credit in 2P
Complete the game in co-op using only one credit each
Complete the game using only one credit in 1P without assistance
Complete the game using only one credit in 2P without assistance
Complete the game in co-op using only one credit each without assistance
Pick up 100 bombs in gameplay
Use a bomb in gameplay
Turn the first boss in the game into dust in the 2P version
Crush the spirit of life out of the second boss in the 2P version
Return the third boss to its maker in the 2P version
Put the fourth boss six feet under in the 2P version
Bring an end to the fifth boss in the 2P version
Bring down the sixth boss in the 2P version
Crush the seventh boss in the 2P version
End the eighth boss in the 2P version
Bring in the termination of the ninth boss in the 2P version
Slaughter the final boss in the 2P version
Eliminate the first boss without assistance in the 2P version
Eliminate the second boss without assistance in the 2P version
Eliminate the third boss without assistance in the 2P version
Eliminate the fourth boss without assistance in the 2P version
Eliminate the fifth boss without assistance in the 2P version
Eliminate the sixth boss without assistance in the 2P version
Eliminate the seventh boss without assistance in the 2P version
Eliminate the eighth boss without assistance in the 2P version
Eliminate the ninth boss without assistance in the 2P version
Eliminate the tenth boss without assistance in the 2P version
Pick up an extra life
Pick up a bonus item
Pick up 25 bonus items in one game
Pick up a double extra life