Those achievments maded to be long term aquiered . At this moment we have 1 - 50~ leves which reward not so big , but should you wait several years to cap raises , new areas will lead player i belive to more highest level leves , and those will lend player more biggest reward . Also who knows if SE decide in future to add leve "chain" like it was in 1.0 for full party ("chain" leaded to great rewards like 80~100k leve lol)