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