The description below the Sneak 100 achievement is unlike the others. Most of the other achievements give a command/order to the user, telling them what to do, for example:
"Create and fully power a Beacon," or
"Collect dragons breath in a glass bottle."
However, Sneak 100's description has a gerund (-ing) at the start:
"Sneaking next to a sculk sensor without triggering it."
Just a parallelism issue.
Wasn’t it called sneak 100?