The bug

Based on MC-80826 the /achievement command does no longer work with statistics however the syntax and error messages are not updated.

[Client thread/INFO]: [CHAT] Unknown achievement or statistic 'test'
[Client thread/INFO]: [CHAT] Usage: /achievement <give|take> <stat_name|*> [player]

Affected translations

commands.achievement.usage
commands.achievement.unknownAchievement
commands.achievement.give.success.one
commands.achievement.take.success.one
commands.achievement.statTooLow

How to reproduce

Use the following commands

/achievement give test
/help achievement