Chronos: Before the Ashes

Spend 30 Attribute points in to Agility.

You earn Attribute Points by earning XP (via killing stuff). Every time you level up, your character will get a momentary gold aura and you’ll hear a high pitched “ding” sound and you'll earn 2 points. You can only unlock the "Put 30 Attribute Points into..." achievements by spending these points.

Every 10 deaths you are offered a new trait (pick 1 of 3) some of which will add points in to the attribute totals - but they do not count towards progression for these achievements. There is however a trait you can pick at age 20 (the first one) called Hard-Earned Wisdom that gives a permanent XP multiplier which can help make this go a bit faster.

Level 70 is the level cap after which you will no longer able to earn attribute points, or benefit from the health replenishment afforded to you when levelling up. So there's 140 points you can earn from just levelling so there's more than enough to fill each attribute with 30 points in a single run.

If you want/need to farm XP, you can do so very easily once you get to the Labyrinth (the Void area with all the floating platforms - like Darksiders, if you're familiar). You will very quickly encounter an enemy type that carries a drum and spawn an add that you can farm indefinitely. There's a section with two of these drum guys in the same area that makes this particularly efficient. They are worth a good amount of XP and you will very quickly rack up enough levels to finish off this set of achievements.