For this achievement you have to find and sit beside a snail for approximately 10-15 seconds.
After waiting the duration the snail should start circling around you and with that should be your achievement.
You can find a snail in the eastern quarter of the map at the bottom right location of the following picture. the area with the snail can be accessed by shooting your rail gun at a tower to spawn some tiles. Followed by a long stretch of falling tiles which you need to chain dash across.https://screenshotscontent-t3002.xboxlive.com/00090000024c81...
Alternatively you can find a snail behind a door that requires 12 key shards, at the bottom right of the village.