Originally Posted by PG13
Can the campaign be played coop?
The campaign can be played coop, but most of the achievements can't be earned in co-op campaign.
These are the only achievements you can earn in co-op campaign:
Accumulate three simultaneous fish shields
Score a 'Barracuda Bonus' by biting a barracuda's tail four times in a row
Eat 500 entire schools of fish, or swarms of bugs
Flippin' Good Time15
Complete a Quadruple Flip
Well Fed Fish25
Accumulate 5000 fish in your food bank
To be honest, these achievements would be earned in due time just playing single player campaign to earn the others.