Twin Milestones include:

Hello World - We are new here (Reverse - Name, date, weight and time)
We are 1 week old
We are 2 weeks old
We are 4 weeks old
We are 6 weeks old
We are 8 weeks old
We are 10 weeks old
We are 12 weeks old

We are 4 months old
We are 5 months old
We are 6 months old
We are 7 months old
We are 8 months old
We are 9 months old
We are 10 months old
We are 11 months old
We are 1!

Our first Mother's Day
Our first Father's Day
I rolled over today (Reverse - 2 x Name, 2 x date)
Today I say up by myself (Reverse - 2 x Name, 2 x date)
Today I learned to crawl (Reverse - 2 x Name, 2 x date)
Today we ate real food (We ate, date)
Today I took my first steps (Reverse - 2 x Name, 2 x date)
I learned to stand today (Reverse - 2 x Name, 2 x date)
Today we had our first needles
I grew my first tooth today (Reverse - 2 x Name, 2 x date)
My first smile happened today (Reverse - 2 x Name, 2 x date)
We are wild children
Last night I slept through the night (Reverse - 2 x Name, 2 x date)
Today I clapped my hands for the first time (Reverse - 2 x Name, 2 x date)
Today I said my first word (Reverse - 2 x Name, 2 x date)
Today I laughed for the first time (Reverse - 2 x Name, 2 x date)
Our first day out
Today we had our tubes removed (Reverse - 2 x Name, 2 x date)
Today I graduated from special care (Reverse - 2 x Name, 2 x date)
Back together after (insert number) days
Our first kangaroo cuddle
Our first cuddle with Mum
Our first cuddle with Dad
Our first tandem feed
It our due date we are (insert number) weeks
Today we went home
Our first family photo