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