There are a total of 20 achievements in Halo: Spartan Strike.[1]

On Windows 8/8.1 and Windows Phone 8/8.1 the achievements are worth 200 Gamerscore gamerscore. All of the same achievements are also found in the iPhone/iPad and Steam versions, though they do not award Gamerscore.

List of Achievements

Icon Name Description Gamerscore  
Campaign
  Welcome to New Mombasa Complete Operation A. 10  
  Homing In Complete Operation B. 10  
  Ready for Departure Complete Operation C. 10  
  Home Sweet Home Complete Operation D. 10  
  No Loose Ends Complete Operation E. 10  
Level-specific
  I Am Your Shield Keep the Elephant 100% intact in Operation A, Mission 3. 5  
  Not a Scratch Keep the Wraith 100% intact in Operation B, Mission 4. 5  
  Night Knight Do not allow the Watchers to resurrect any Knights in Operation C, Mission 4. 5  
  Beam Dance Complete Operation D, Mission 5 without getting hit by a Focus Turret. 5  
  Mine Sweeper Do not get hit by any Proximity Mines in Operation E, Mission 2. 5  
Stars
  Experienced Earn your first Gold star. 5  
  Battle Hardened Earn all Gold stars in Operations A through E. 20  
Challenges
  Big Spender Spend 10,000 credits on loadout upgrades. 20  
  GEN2 Use every Armor Ability at least once. 10  
  Thorough Complete all Assault Ops for Operations A through E. 20  
Vidmaster Challenges
  Vidmaster Challenge A Complete Operation A, Mission 6 with the Blind and Thunderstorm Skulls active. 10  
  Vidmaster Challenge B Complete Operation B, Mission 6 with the Hollow and Pacifist Skulls active. 10  
  Vidmaster Challenge C Complete Operation C, Mission 6 with the Black Eye and Pacifist Skulls active 10  
  Vidmaster Challenge D Complete Operation D, Mission 6 with the Famine and Thunderstorm Skulls active 10  
  Vidmaster Challenge E Complete Operation E, Mission 6 with the Hollow and Black Eye Skulls active 10  

Sources