U L T R A _ H A R D C O R E - 100 Words Achievement "Unreal" (Score of 26152)
Achievement pop at 5:05. Yes, you need to have a round go for about 5 minutes straight (though it does depend on your speed, it could be a little longer or shorter than this).
U L T R A _ H A R D C O R E is just this simple yet frustrating multitasking typing game. Removed by Steam though, unfortunately, and only one key or something still exists that hasn't been activated.
I played this via family share of course. Barely anyone has it 100%, but it only took me 4 hours (got really really close to 100 words at the 3 hour mark too but choked). Not that bad of a 100%, pretty fun, requires some dexterity.
A huge tip: slow down. Think about every key press very carefully such that you do not make a typo, screwing yourself over. I paced myself very well, and it paid off as you can see in this video. Make sure once the words get longer that you don't go TOO slow though, since you could run out of time.