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