@Khitarra your correct about that the teleports dont work , The reason why it costs 200 points is because it boosts thieving xp by 15% i think it was.
Besides that seeing that alot of people already grinded out the achievments and bought the items it doesnt feel right to change the way achievments work.
No support from me.
The people who have already got the points would meet the requirements for the tiers, so no one would lose out on anything. When future Achievements/items/teirs are added, they will be set to hit the ground running to reach them.
15% thieving xp (which is hardly nothing, 80 more xp per thieve for classic) is 200 points but being able to hit 22s at 35 magic only costs 30 points.. if the teleports worked on the cape it would be worth 200 points. Im pretty sure the teleport fix has been suggested before, but I CBA to go through that massive list of suggestions to check.