Here is the full list of all 13 Emi - there are Christmas Special achievements.
Welcome to the Christmas Special.
The Morn of Christmas!
A wild Eugene Appeared!
Welcome to the North Pole!
Away We Go!
Just for her...
She drank it!
Just a little mid-work lunch break...
That's just too much for me thank you!
That looks... fun?
A little 'end of the night' snack!
That bugger!