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