Here is the full list of all 7 Project Lounge achievements.
Fall out of the Lounge... and go back to where you came from.
Pick up an object for first time.
You launched the game at 1AM. Sure you shouldn't be sleeping?
As a host have 7 visitors in your Lounge.
Save your very first Lounge.
As a visitor spawn an item in someone else's Lounge.
Press apply button at least once in Options Menu.