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