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