Here is the full list of all 20 Rogue Company achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Win a match without purchasing a primary weapon
Win 100 matches
Play 25 hours in a party
Revive a total of 100 players
Win 8 matches with 8 different Rogues
Fully upgrade a primary weapon
Accrue a total of $70,000 in a single match
Down an enemy with a gadget while looking away from them
Down an enemy while you have less than 10% health
Complete the tutorial
Down an enemy while riding a zipline
Deal a total of 10,000 damage to players via headshots
Down 4 enemies in one round
Down 20 enemies in a single match
Pick up another player's weapon and down an enemy with it
Down an enemy with a melee weapon
Deal 1,000 damage with gadgets
Down an enemy without taking return damage
Down 10 enemies
Purchase 3 perks in a single match