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.
Reach Tech Level 100
Collect 25,000 Goons
Destroy 25 Starbases
Complete 100 Missions
Bribe Past 5 Warpgates
Complete the Game
Destroy 2500 Enemy Ships
Research a Category to Level 10
Collect 100,000 Rez
Unlock All Ship Hulls
The Clockwork II
Destroy a Tier 3 CIV Base
Destroy a Tier 3 UTA Base
Reach Tech Level 50
Collect 2,500 Goons
Explore 50 Star Systems
Upgrade the Clockwork
Complete 25 Missions
Collect 10,000 Rez
Destroy 500 Enemy Ships
Space 250 Goons
Collect an Uncommon Specialist
Collect an Elite Specialist
Explore 10 Star Systems
Collect a Rare Specialist
Retire a Specialist
Train a Specialist to Expert
Collect a Godlike Specialist
Bribe Star Relations 5 Times
Reach Tech Level 10
Mass Retreat 5 Times
Collect 250 Goons
Collect a Common Specialist
Destroy 100 Enemy Ships
Collect 1,000 Rez
Escape the Sol System
Complete 5 Missions
Repair the Clockwork
Explore 150 Star Systems
Unlock All Components
Complete the Game on Expert
Complete the Game on Insane
Never use Respec
Beat a Warpgate 10 levels higher than you
Clear all zombie infection
Feed Santa so much milk and cookies, that an elf falls off his sleigh
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.