Full list of all 57 Dark Void achievements worth 1,250 gamerscore. It takes around 15-20 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 47 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 10 achievements worth 250 Gamerscore.
Grease Monkey - Upgrade all weapons
Blind Luck - Kill one of each enemy footsoldier using blind fire
Those Aren't Fortune Cookies - Step on 10 slugs
Death from Above - Kill 50 enemies while hovering
Bird of Prey - Kill 25 footsoldiers using your rocket pack guns
Demolition Derby - Collide with another UFO 10 times
Fireworks - Kill 10 airborn enemies using grenades
99 Red Balloons - Kill 10 enemies while they are in an anti-gravity bubble
Complete Dark Void
Complete Tower of Return
Complete The Revolt
Bookworm - Find all journals
Float Like a Butterfly - Escape from 10 melee attacks
Master of Arms - Kill an enemy with every rifle weapon
Complete The Collector
Complete Defending the Ark
Complete Breaking Camp
I'm a Rocketman, Baby - Perform 100 special maneuvers with the rocket pack
Grand Theft...UFO? - Hijack 20 UFOs
Captain of the Ship - Destroy 10 enemy aircraft while yours is on fire
Light Up the Sky - Destroy 25 targets with the Ark's AA guns
The Devastator - Destroy 25 UFOs while piloting a Survivor fighter
Complete Prison Escape
Cleanup on Aisle Three - Kill 100 enemies with headshots
Pack Rat - Acquire 30,000 Tech Points
Complete The Survivors
Complete Prophesied One
Complete Into the Void
Rocket Clothesline - Melee an enemy immediately after landing
The Squishy Center - Kill a Sarpa piloting an Archon
Forgot My Tow Cable - Fly through an Archon's legs
Get Your Feet Wet - Buzz the water
Complete Village Attack
Rochambeau, I Go First - Kill 50 enemies with melee attacks
Cliffhanger Killer - Kill 50 enemies while in vertical cover
Big Bang - Destroy a Knight using a grenade
Complete Spare Parts
Tesla's Apprentice - Upgrade first weapon
Terminal Velocity - Free fall for 10 seconds
Complete The Village
Complete Crash Site
Blue Light Special - Kill 3 enemies with one grenade
Killing Spree - Kill 10 enemies within 60 seconds
Dear Diary - Find a journal
Complete Prologue
Mark of the Adept - Destroy 5 UFOs in the Prologue
Ultimate Bad Ass - Complete Dark Void on Hardcore
Complete a wave in any Survivor Mission
Complete any survivor mission
Complete the Battle of Ghen Crag mission with 980,000 points
Complete the Abyss Canyon mission with 1 million points
Rack up a killing spree bonus of 33x
Complete a wave in a survivor mission without taking damage
Complete any survivor mission in under 35 minutes
Upgrade a weapon to stage 3 in a survivor mission
Complete the Battle of Ghen Crag mission with 4.4 million points
Complete the Abyss Canyon mission with 4.5 million points