Here is the full list of all 25 A-Men achievements.
Complete all missions in the Forest, at the Seacoast, in the Winterland and in the Factory with S rank.
Complete all missions in the Forest with S rank.
Complete all missions at the Seacoast with S rank.
Complete all missions in the Winterland with S rank.
Complete all missions in the Factory with S rank.
Buy all shop items in the game.
Buy 10 Private shop items.
Buy 10 Engineer shop items.
Buy 10 Commando shop items.
Buy 10 Spy shop items.
Buy 10 Muscleman shop items.
Complete all missions in the Forest, at the Seacoast, in the Winterland and in the Factory with at least A rank.
Complete all missions in the Forest with at least A rank.
Complete all missions in the Seacoast with at least A rank.
Complete all missions in the Winterland with at least A rank.
Complete all missions in the Factory with at least A rank.
Complete all missions in the Forest, at the Seacoast, in the Winterland and in the Factory with at least B rank.
Exterminate 1000 enemies.
Read all tips in the Forest, at the Seacoast, in the Winterland and in the Factory.
Unlock the first Winterland level.
Unlock the first Seacoast level.
Unlock the first Factory level.
Exterminate 5000 enemies.
Kill 10 enemies in the combo 10 times.
Beat the final level in the Factory.