Here is the full list of all 18 Assassin's Creed Chronicles: India achievements worth 1,000 gamerscore.
Complete Assassin's Creed® Chronicles: India in Plus Hard mode without being seen once.
Achieve Assassin Gold Style rating 30 times.
Achieve Silencer Gold Style rating 30 times.
Take down 100 enemies.
Have 100 enemies pass by you whilst using Helix Blend.
Multi kill 200 enemies.
Dispose of 100 enemies using Helix Blade.
Pickpocket or Loot 100 enemies without being seen.
Use the Smoke to pass by 100 enemies.
Complete Assassin's Creed® Chronicles: India without killing anyone.
Complete Memory Sequence 4 in under 9 minutes.
In Memory Sequence 3, rescue Hamid in under 5 minutes.
Complete Assassin's Creed® Chronicles: India.
Complete Memory Sequence 9 in under 7 minutes.
Clear the Mortar Guards in Memory Sequence 8 without taking any damage.
Achieve Shadow Gold Style rating 30 times.
Complete Memory Sequence 1.
Reach the maximum score multiplier in any memory sequence and maintain it for two more sections.