Here is the full list of all 24 Lake of Voices achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
The dead cannot be revived
Continued forward no matter the loss
Suffered in silence
The only path
Yet a way was found
Became true partners
Created a miracle
Remained sheltered from the reach of Nixi
It almost could have been
That is all he ever says
Drowning in every drop
Persevered through all the hurt
Spirits were lifted together
Protecting what matters until the end
A fearful and reckless conclusion
Found one’s pride
Escaped the void and returned to light
Hearts were eased with someone special
The price one must pay
Stepped foot on the bridges of Sinnlos