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