Here is the full list of all 35 1st Core: The Zombie Killing Cyborg achievements.
First time you make a HeadShoot.
Driving over a bug to kill it.
Discover +75% of any map.
Collect 100 KG of Garbage on 1 stage.
Get all 5 types of Weapons.
Destroy Both types of Hive.
Kill 100 on a Single Stage.
Complete First Area, without killing anybody.
Started the Game more than 5 times.
Get +5 in Str, Dex, Speed & Per.
Buy All the Cyborgs.
Start the game on Hard Mode.
Start The Game on Medium.
Start The Game on Easy.
Start The Game on God Mode.
Complete the Game as God.
Complete the Game on Easy.
Complete the Game on Hard.
Complete the Game on Medium.
Complete the Game Using only the Pipe as Weapon.
Use the Cheat Code....
Kill a Spider 'the right way' on Stage 1.
"Kill it with Fire" on stage 2
Something to read in The Awards Scene.
Some Action you can do from Stage 2+.
Going back from The MissionMap Scene
Something you don't have to do in The Options Scene.
The Right Day to Start a New game.
Recycle Something Wrong
Sound of Silence.
Level 10 Minigun
Level 10 Uzi
Level 10 Revolver
Take a ScreenShot with F12
Take 5 ScreenShots