Installing multiple .apk files on your Android will always be a big task as you have to go through the process step by step. AUTO-APK Installer is a free tool which is capable of carrying out the installations of batches of APKs without requiring any further input from the user.

AUTO-APK Installer is designed to be run on Windows PCs and uses an ADB connection to install the files to your device. You need only to copy the desired APKs to a specific folder and run the tool, and it will do the rest for you.

More details and download links available here.