Here is the full list of all 48 Space Pirates and Zombies achievements. It takes around 100-120 hours to unlock all of the achievements on Windows.
Complete the Game
Never use Respec
Feed Santa so much milk and cookies, that an elf falls off his sleigh
Collect a Godlike Specialist
Clear all zombie infection
Collect 25,000 Goons
Research a Category to Level 10
Complete 100 Missions
Reach Tech Level 100
Destroy 2500 Enemy Ships
Unlock All Ship Hulls
Collect 100,000 Rez
The Clockwork II
Unlock All Components
Beat a Warpgate 10 levels higher than you
Reach Tech Level 50
Destroy a Tier 3 CIV Base
Bribe Past 5 Warpgates
Destroy a Tier 3 UTA Base
Explore 50 Star Systems
Collect a Rare Specialist
Collect 2,500 Goons
Upgrade the Clockwork
Collect a Common Specialist
Complete 25 Missions
Destroy 500 Enemy Ships
Retire a Specialist
Space 250 Goons
Collect 10,000 Rez
Train a Specialist to Expert
Explore 10 Star Systems
Mass Retreat 5 Times
Collect an Elite Specialist
Collect an Uncommon Specialist
Bribe Star Relations 5 Times
Collect 250 Goons
Reach Tech Level 10
Destroy 100 Enemy Ships
Complete 5 Missions
Collect 1,000 Rez
Escape the Sol System
Repair the Clockwork
Destroy 25 Starbases
Explore 150 Star Systems
Complete the Game on Expert
Complete the Game on Insane
Beat all 10 arena ladders and all 5 tiers on bronze, silver and gold level. Be the champ of 150 events..
Defeat a Tier 3 Bounty Hunter Stronghold in Chapter 4. In short, do the impossible. You have our sympathy.