Here is the full list of all 24 The Last Leviathan achievements.
Win the 100tp Race - Inner Seedar Isles
Played for 1 hr
Destroy Targets in Lords & Jarls Crusade
First Kill
First Ship Uploaded to Workshop
10 Ship Kills in any mode
25 Ship Kills in any mode
50 Versus mode Wins
Defeat the Pirate Siege
Defeat the Lords & Ladies Retribution Siege
Destroy 3 Pesky fish
Survive Lords & Jarls Crusade Survival Challenge
Survive Lords & Jarls Crusade Seedarian Survival Challenge
Played for 5 hrs
Played for 10 hrs
Get 3 stars in all challenges in Lords & Jarls Crusade
Get 3 stars in all challenges in Lords & Jarls Crusade - Defector
Harpooned and Retreaved your first 'thing'
Harpooned a Pesky Fish
Placed 1000 Blocks
Placed 10000 Blocks
Win the 500tp Race in Lords & Jarls Crusade - Defector
10 Uploads to Workshop
10 Subscriptions to workshop items