Not all achievements are equal, and just because something's listed as an achievement doesn't make it easy.
Some are certainly very easy, like hitting level 10, while others are definitely not, like killing DIablo in Inferno difficulty on a hardcore character.
Where the speed runs fall on the easy/hard scale really depends on area size and luck (like picking the right tomb in act 1 for the Skeleton King's crown). Since there's no set difficulty tied to the speed run achievements, you could certainly do them in a decked out level 60 character on normal.
Also, it's worth pointing out that there's some legitimate solo speed run videos of Diablo 2 normal mode completed under one hour starting from level one. There's also a video of a full clear from normal to hell also starting at level one done in a bit over 4 hours. Does that mean that Diablo 2 is easy? Or that most players clear the game that quick solo?
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Some are certainly very easy, like hitting level 10, while others are definitely not, like killing DIablo in Inferno difficulty on a hardcore character.
Where the speed runs fall on the easy/hard scale really depends on area size and luck (like picking the right tomb in act 1 for the Skeleton King's crown). Since there's no set difficulty tied to the speed run achievements, you could certainly do them in a decked out level 60 character on normal.
Also, it's worth pointing out that there's some legitimate solo speed run videos of Diablo 2 normal mode completed under one hour starting from level one. There's also a video of a full clear from normal to hell also starting at level one done in a bit over 4 hours. Does that mean that Diablo 2 is easy? Or that most players clear the game that quick solo?