Several of the achievements listed were introduced in 1.4.1, which makes sense why they are disproportionately lower. I'm actually one of the people who did 200 fishing quests, but "never" fished in lava, just because I did most of my play before 1.4.1

i used to have a screenshot right when terraria 1.4 first came out showing the achievement of making a workbench with like "1.3% of people have this achievement"

Golem fight is just so easy to curbstomp that it is easier to defeat Golem than to enter his house.

Regarding the Timber and surviving your first night achievement, this is also something you see with MMO games where people get bored or lose interest very fast. I think it's more to do with the fact that maybe someone buys the game (or gets it as a gift) and either doesn't play it or they bought it when it was on sale on steam "Just in case"

Hi! before 1.4 the Reaver Shark Pickaxe had 100% mining power, and u can get that pickaxe very early game by fishing in the sea biome, so most of the people go for that and ignore the molten pickaxe (sorry for my english, not my lenguage) :D

another really weird

I like how for a lot of games, the most common achievement roughly tells you how many people who got the game played it.

the Funkytown achievement is bugged, so if you are in any mushroom biome and teleport to spawn (which is most likely on the surface) it still registers that you are in a mushroom biome, but thinks it's at the spawn location, and grants you the "Funkytown" achievement.

Man you underestimated how the majority of people don't like fishing for the angler terraria. Also about fishing in lava, It's introduced in 1.14 which made me just never think about it. I do fish in most playthrough but doing it in lava is just not a thought that came in mind despite me knowing it since i kept in touch with terraria updates around the journeys end update

More people have the Zenith achievement than the "Beating the Moon Lord" achievement. You can tell people really played the game.

Before 1.4, Reaver Shark is very powerful! As well as fishing crates, then opening them in Harmode. That's why pretty much skips Molten Pickaxe before. Also, I think you can still skip Molten Pickaxe now by fishing crates in Hardmode.

Funkytown can be obtained in pre-hardmode, while the truffle npc can only be obtained in hardmode.

Here is another point with the lava fishing: Terraspark Boots. Specifically the lava charm.

At 12:50, you don't NEED a molten pickaxe since you don't NEED hardmode ore to beat the game. it is just very handy to obtain and make hardmode ore tools and armour.