Here is the full list of all 21 Ninjas Against the Machines achievements.
Complete all Misstep Challenges
Complete all Determination Challenges
Complete all Javelin Mastery Challenges
Complete all Dedicated Challenges
Complete all Constant Assassin Challenges
Complete all Returned Projectiles Challenges
Complete all Hoarder Challenges
Complete all Perfect Aim Challenges
Complete all Jumping Javelins Challenges
Complete all No Throwables Challenges
Complete all Billionaire Challenges
Complete all Test Master Challenges
Complete all Replenisher Challenges
Complete all Challenge Master Challenges
Complete all Learning Is Fun Challenges
Complete all To The End Challenges
Complete all Swift End Challenges
Complete all Masochist Challenges
Complete all Flawless Victory Challenges
Complete all What A Rush Challenges
Complete all Slam Kills Challenges