Here is the full list of all 18 Half dead achievements.
Discover fifty rooms
Find fifty traps
Find thirty traps
Find fifteen traps
Discover ten rooms
Discover five rooms
Find five traps
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