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