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