I had a problem too, just got it though. I had to first zoom OUT. Ctrl + scroll down a little ways, then un-maximize the window, grab the top of the window and drag it down until it touches. I got it immediately. I had been trying from zoomed in, never worked.
184.108.40.206 wrote: How the f*** can I get the 'Dunk the Cookie' achievement? This is the last this missing for me ><
Its Easy Step 1. Click The Square In The Middle Of _ and x. Step 2.Then Put Ur Arrow On Top Of It. Step 3.U Will See This -->↕Then Hold Mouse Then Move IT Down. Step 4.The Cookie Will Touch The Milk. Thats it. OR Do This. Click The Gear Next To The X Or Click Alt+x Then Click Zoom Then Click 400 The Cookie Will Touch The Milk If U Want It Back Do The Same Thing Then Click 100