Not all achievements have icons yet. That will be a side project @w@

Any achievements you have unlocked in-game should unlock related Steam achievements when launching. Steam achievements are additive and will not lock again if save data is erased.

1.9.9 also fixes:

• It was impossible to get the campaign clear achievements, as it expected you to clear a stage that doesn't exist yet.
• An issue with case-sensitive filesystems made one unlockable track unplayable.
• The game will now pause when going to the Steam overlay.
• macOS Steam depots have now been enabled.

There is an issue where unpausing after viewing the Steam overlay may trigger the pause dialog a second time. I'm trying to understand why it does this.