I really really like achievements, but I have a few rules for them.
1.) If an achievement is based on collectibles, I skip it.
2.) If an achievement is based on some multiplayer requirement that requires months of play. I don't aim for it.
3.) If an achievement has some one-off goofy but hard to pull off requirement, I make it my life's mission to accomplish it.
if the collectibles are easy , why not , but if they are like AC2 and useless...fuck no ( feather collecting is the worse thing ever )