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