This is a simple script that will simplify the installation of Arch Linux. The script (by user's permission) will install grub and other packages necessary for work.

Download latest version of ArchLinux
Boot on the USB bootable device
Run commands:

wget https://raw.githubusercontent.com/h3xb0y/arch-installer/master/install.sh
chmod +x install.sh
./install.sh

For russian users:

wget https://raw.githubusercontent.com/h3xb0y/arch-installer/master/install_ru.sh
chmod +x install.sh
./install.sh

Follow the instructions

Take a look at ArchLinux Installation Guide to view the official documentation.