Since acer liquid mini is not much popular finding a rooting process for this phone is very hard,but not impossible,its just easy like other phones.just follow the following steps to root your liquid mini
You will require the following things to root 1.PC with atleast windows XP 2.latest drivers of liquid mini installed on PC
STEP 1
*Download one click root for your pc (link provided)
STEP 2
*Connect your phone to PC through USB port
STEP 3
*Enable the USB debugging of your phone, to enable it go to setting>applications>development >USB debugging.
STEP 4
*Run the one click on your PC and click on 'root now'
One click is tested to work on liquid mini,so you don't fear the chance of bricking your device
DOWNLOAD LINK:https://s3.amazonaws.com/oneclickroot/OneClickRoot.exe