Here is the full list of all 28 Wild Warfare achievements.
Defeat 10 enemies
Defeat 50 enemies
Defeat 100 enemies
Defeat 200 enemies
Get defeated 25 times
Get a 20 player killstreak
Get a 10 player killstreak
Get an 8 player killstreak
Get a 6 player killstreak
Capture the enemy flag as a Heavy
Take down a player who has your team's flag
Pilot the Raptor
Hold the Snail for 1 hour in total
Hold the Snail for 100 seconds in a row
Get a 4 player killstreak
Take down someone while they are airbourne
Demonstrate you know where the mouse 1 button is
Demonstrate you really know where the mouse 1 button is
Take down a developer
Take down someone who has taken down a developer
Capture the enemy flag 100 times
Return your flag to the base 100 times
Return your flag to the base 10 times
Capture the enemy flag 10 times
Capture the enemy flag 50 times
Get 10 killstreaks in a match
Return your flag to the base 50 times
Get 20 killstreaks in a match