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