Made a new town in v0.9.7a to try and get this. Didn’t use any hunters at all and made sure not to buy any meat along the way. Hit t4 with the town centre, but the achievement hasn’t registered. Tried to exit back to the main menu to reload the town and see if that triggered it, but game got stuck trying to go back to the main menu so I used task manager to end it. Updated to v0.9.7b and then loaded the town in again and let it run through to the next year, but still haven’t got the achievement.
Also think that I should have The First Winter Vanquished because far as I know I didn’t lose any villagers during the first year.
Emailed the file to you in case you need it - Meat Free town
