Here is the full list of all 34 Battlewake achievements.
Complete Diego's Campaign Missions
Complete Rev's Campaign Missions
Complete Calavera's Campaign Missions
Complete Zhang's Campaign Missions
Complete All Campaign Missions
Get 3 stars on all Campaign Missions
Sink an enemy by ramming them with Winds of Solomon
Sink 3 enemies with a single Tentacle Slam
Sink 3 enemies with a single Soul Shield explosion
Sink an enemy ship by smashing another one into it with Aeon Tide
Sink 4 enemies in Diego's Maelstrom at the same time
Sink 4 enemies with a single Kraken
Sink 4 enemies with a single Forsaken Spear
Sink 6 enemies with a single Immortal Swell
Reach level 20 with Diego
Reach level 20 with Rev
Reach level 20 with Calavera
Reach level 20 with Zhang
Reach level 20 with all Captains
Upgrade a ship
Fully upgrade a ship
Fully upgrade all ships
Complete a defense mission without your fort taking damage
In Warfare, upgrade a stat
In Warfare upgrade one stat to level 15
In Warfare upgrade one stat to level 15 without upgrading any other stats
In Warfare, equip a new weapon.
In Warfare, equip a legendary weapon
Complete round 6 in warfare without spending any grog
Complete 9 successive rounds of warfare without dying
Complete Round 1 of Warfare
Complete Round 9 of Warfare
Complete Round 15 of Warfare
Earn all other trophies