Here is the full list of all 18 Half dead achievements.
Find fifty traps
Discover fifty rooms
Find thirty traps
Find fifteen traps
Discover ten rooms
Find five traps
Discover five rooms
Find a trap
Discover a hundred rooms
Discover three hundred rooms
Discover five hundred rooms
Discover а thousand rooms
Discover two thousand rooms
Discover five thousand rooms
Find a hundred traps
Find two hundred traps
Find five hundreds traps
Find a thousand traps