The Achievement Command

The /achievement command is a rare command used to bypass getting achievements normally.

Overview
The /achievement command can either give or take certain achievement(s) from player(s).

Syntax
/achievement  [player]

Explanation
The give/take value is the decision if you want to give or take the achievement. The achievement name is obvious, and the player is the player you want to target.

Trivia

 * Not commonly used.