Tom's Birthday

To collect the Tom's Birthday achievement, play the game on Tom Purcell's Birthday which is August 26th. By default, this achievement is locked, and the display text is 'Locked' and the description says 'This achievement is hidden'.

Interestingly, the game released in November of 2018, so this achievement and card still cannot be collected without cheating.

Reward
The reward card is Birthday Tom Purcell.