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Floating Smash Up

Destroy 10 Sea destructibles

Floating Smash Up0
1 guideOffline Game Mode - These achievements require play in game modes that do not necessitate a connection to any online services.Single Player - These achievements can be obtained by a single player.Cumulative + - These achievements are obtained by repeatedly performing the same action or set of actions over time.
14 Sep 2018
9 0 0
This is unlockable once you get Marceline in the party, which lets you use the ship cannon.

I found 10 destructibles in a couple minutes in and around the Evil Forest area. (They look like rafts loaded with crates.) Just sail right at them and press cn_X to blast them with the cannon. They respawn quickly so you should be able to grind this out in no time at all.