Here is the full list of all 30 Cladun Returns: This Is Sengoku achievements.
Clear Chapter 8 stages.
Obtain a rare artifact in a dungeon.
Clear Chapter 7 stages.
Clear Chapter 6 stages.
Clear Chapter 5 stages.
Switch jobs.
Clear Chapter 4 stages.
Play a Neo-geon or Tri-geon for the first time.
Clear Chapter 3 stages.
Clear Chapter 2 stages.
Release and recruit a soul for the first time.
Clear Chapter 1 stages.
Update Clear Time for the first time.
Complete the Magic Circle tutorial.
Clear Chapter 1: Anegawa.
Clear Chapter 9 stages.
Clear all stages in the story.
Clear all EX stages.
Level a character from 1 to 99.
Obtain equipment in a dungeon that has 4 titles.
Recruit all Lords.
Expand a fort to its maximum.
Complete every entry in the Bestiary.
Complete all quests in the suggestion box.
Clear the 99th floor of a Neo-geon.
Clear the 99th floor of a Tri-geon.
Have a character learn every Magic Circle.
Have a character reach LV 99 in every job.
Unlock Death-geons.
Increase your Fame to 999.