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