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