To Attain, To Reach, To Get To, To Arrive At
する verb
You know that 達 means attain. So, when you add する to it you make it a verb. Now it means to attain.
たっする
This reading for this is a bit of an exception. You know the reading for 達 is たつ, but here it's shortened, to just たっ. So make sure you remember.
ビットコインは十年以内に100万ドルに達するでしょう。
Bitcoin will reach one million dollars within a decade.
目標人数に達するまで、あと少しです！
Only a little longer until we attain the target number of people.
ワニカニでは、あるレベルに達するとコウイチのカラオケ動画が流れるらしい。本当かな？
I heard that at WaniKani, when you reach a certain level, Koichi’s karaoke video is played. I wonder if it's true.