Catan Cheats - Xbox 360

Achievements
Complete each of the following achievements below to get the allotted gamerscore:

Ambassador of Catan (10) - Invite a friend to play Settlers of Catan.
Builder of Catan (20) - End any game of Catan in possession of the Longest Road card 10 times.
Chancellor of Catan (20) - Collect 1000 Victory Points in ranked match play.
Citizen of Catan (20) - Collect 100 Victory Points.
Elder of Catan (20) - Collect 250 Victory Points.
Knight of Catan (20) - End any game of Catan in possession of the Largest Army card 10 times.
Merchant of Catan (20) - Acquire 100 resource cards in trade in any game of Catan.
Professor of Catan (20) - Win a Single-Player game against Hard AI's.
Scholar of Catan (10) - Win a Single-Player game against Moderate AI's.
Settler of Catan (10) - Build a settlement in any game of Catan.
Statesman of Catan (20) - Collect 500 Victory Points in ranked match play.
Villager of Catan (10) - Collect 25 Victory Points.

Glitch: Easy VP Achievements Glitch
I stumbled across a glitch to get the Villager (earn 25 victory points), Citizen (earn 100 VP), and Elder (earn 250 VP) achievements very easily. When you are placing your second settlement at the start of a new game, first place it and then select undo. Keep doing this over and over until you get all of the solo VP achievements. Apparently every time you place the settlement the score is added to your running total, but when you undo the action it never gets subtracted.