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