Here is the full list of all 29 Second Extinction achievements.
Unlock all perks for one weapon.
Play 20 missions at night.
Complete 40 Contracts.
Respawn 20 times.
Complete 20 Contracts.
Kill 20 Enemies with Supply Drops.
Deploy 20 times.
Kill 2000 Enemies.
Complete a mission without using a Health Stim.
Complete 10 Contracts.
Kill a T-Rex with a Supply Drop.
Complete the mission "Charged Extraction".
Complete the mission ”Research And Rescue".
Complete all core missions.
Deploy 10 times.
Find the golden egg.
Complete the mission "Vestige".
Complete the mission "Contact".
Kill 750 Enemies.
Complete the mission ”Black Site".
Complete the mission "Homebound".
Complete a mission without any on the team having to respawn.
Take a raptor with you when you extract.
First Deployment.
Respawn 40 times.
Respawn 100 times.
Deploy 50 times.
Deploy 100 times.
Kill 6666 Enemies.