Full list of all 24 Collisions achievements.
The base game contains 15 achievements, and there are 3 DLC packs containing 9 achievements.
Witness the rise of a full moon
Witness an annual meteor shower
Witness the sunset during an equinox or solstice
Clear the table in Opie's pinball
Clear the table three times in a row
Clear the table five times in a row
Experience a malfunction on the most unlucky day of the year
Feel the earth tremble on the rarest day in the calendar
Catch the fireworks on the last day of the year