Here is the full list of all 15 Broforce achievements worth 1,000 gamerscore. It takes around 3-4 hours to unlock all of the achievements on Xbox One.
Finish the campaign.
Finish the campaign on hard.
Finish the Ironbro campaign.
Kill a terrorist with a returned grenade.
Kill a terrorist with a deflected bullet.
Kill a terrorist with a martini.
Kill 10 terrorists with a single turkey bomb.
Literally punch Satan so hard that he explodes.
Throw Satan off a cliff as Brommando.
Kick an enemy 3 times before they land as Timebro.
Throw an enemy off the sky fortress as Indiana Brones.
Have four players flex onscreen at the same time.
Kill an enemy by launching them on a propane tank.
Die as Brominator while in metallic form.
Kill all the seagulls on the world map.