Here is the full list of all 34 Infinity Blade: Saga achievements worth 1,000 gamerscore.
Do 10 combo attacks
Do 5 parries
Do 50 dodges
Do 25 blocks
Cast magic 5 times
Do a bonus combo attack
Do 5 super moves
Do 5 stab attacks
Do a mega hit
Do a great parry
Do a perfect block
Siris reaches level 25
Master an item
Upgrade an item
Upgrade an item to level 6
Fuse a new gem
Cook a potion
Use a crafted potion
Use a prize wheel
Collect 30 potion ingredients
Buy 3 items from the merchant
Acquire 1,000,000 gold
Finish a fight with a Light Weapon without Siris taking damage
Finish a fight with a Heavy Weapon without Siris taking damage
Finish a fight with a Dual Weapon without Siris taking damage
Defeat 100 Titans
Do 50 slash attacks
Do 50 perfect parries
Chapter 1 completed
Game completed
Obtain a level 4 item
Burned 10000 energy
Do 5 dodges
Do 25 parries