Here is the full list of all 50 The Walking Dead: Survival Instinct achievements worth 1,000 gamerscore.
Chose to Travel at Least Once with Every Optional Survivor
Explored 25 Unmarked Travel Locations
5 Survivors Were Killed While Scavenging
Completed the Game with Only 1 Firearm and 1 Bullet Left in Your Inventory
Dismembered All Limbs of 5 Walkers
Dismembered 250 Limbs
Killed a Walker That Is Falling Due to Dismemberment
Prevented 50 Walkers from Grabbing You
Arrived at Final Destination with Only Female Survivors
Entered Sherwood Without Any Survivors
Survived 5 Breakdowns
Completed All Marked Destinations on the Map
Collected Every Stuffed Squirrel
Found Every Poster
Found Every Useable Vehicle
Completed a Marked Destination on the Map without Taking Any Damage
Consumed 50 MREs
10 Walkers Were Killed with Saw Blades in the Logging Camp
Consumed 250 Fuel
Shot a Walker with 10 Bolts without Killing It
Restored Survivors 25 Times
Completed a Marked Destination on the Map Using Only the Crossbow
Completed the Final Marked Destination on the Map
Prevented a Walker from Damaging You by Severing Its Attacking Limb
Killed 100 Walkers while Grappling
Fired 300 Bullets
Killed Walkers Using Every Ranged Weapon
Arrived at Final Destination with Only Male Survivors
Completed the Third Act
Completed the Second Act
Shot a Walker in the Knee with a Bolt
Pulled a Bolt From a Walker Then Killed Them With It
Killed Walkers Using Every Melee Weapon
Distracted 50 Walkers with Items
Killed 5 Walkers with One Explosion
Completed 25 Optional Objectives
Perished 13 Times
Completed the First Act
Explored an Unmarked Travel Location
Performed Execution Kills on 50 Walkers
Completed a Marked Destination on the Map without Killing a Walker
Killed 5 Walkers in the Cabot Ridge Creek Bed
Dismissed a Survivor
Killed Multiple Walkers with One Bullet
1 Optional Survivor Recruited
Killed 4 Walkers in a Single Grapple Sequence
Sprinted Until You're Exhausted 10 Times in One Level
Completed a Marked Destination on the Map Using Only Firearms
Completed a Marked Destination on the Map without Being Grabbed by a Walker
Completed the First Location