Full list of all 28 Knight's Retreat achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Completed the daytime retreat
Retreated three knights on the same stage
Retreated two knights on the same stage
Completed a retreat in a stage with each variety of piece
Rearranged a queen to allow the retreat
Rearranged a bishop to allow the retreat
Rearranged a rook to allow the retreat
Rearranged a knight to allow the retreat
Started the retreat
Manage to retreat at level 27
Indirectly shoot the first type of pressplate
Complete the desert retreat
Retreat with two knights at the same time
Retreat with three knight at the same time
Retreat two linked knights, but at different times
Manage to retreat at level 50
Retreat a group of two linked knights
Manage to retreat at level 53
Complete the afternoon retreat
Manage to retreat at level 56
Use a troop to make a tile untargetable by your enemies
Indirectly shoot the second type of pressplate
Make a untargetable path using the golden knight
Complete the nightime retreat
Manage to retreat at level 66
Manage to retreat at level 70
Complete the volcanic retreat
Succesfully retreat all the knights