Here is the full list of all 36 Ninja Tycoon achievements.
Recruit a Ninja
Research Build Area 2
Take over a Region
Recruit 10 Ninjas
Hire 30 Workers
Let the reinforcements bar reach 290
Survive Arcade Mode for 1 Year
Hold 5000 Gold
Gather 1000 Wood
Complete a Mission
Fully Max a Ninja
Unlock all Research
Craft a Tier 1 Equipment
Craft a Tier 2 Equipment
Craft a Tier 3 Equipment
Specialize a Ninja
Send a Ninja to secure a Region
Send a Ninja to reinforce the previous Outpost
Complete a Mission with Difficulty 4
Complete a Mission with Difficulty 7
Complete a Mission with Difficulty 10
Gather a Diamond
Build a Hospital
Build 4 Training Fields
Complete a Mission with 5 Ninjas
Complete a Mission of Difficulty 1 with a Level 100 Ninja
Kill 200 Raiders
Survive a Raid
Take over the final Region
Research Training Field 3
Research Tower 2
Assassinate the Clan Leader
Use a Workshop Unit
Craft 30 Pieces of Equipment
Construct 20 Buildings
Play Arcade Mode