×
King Dugan's Dungeon 2.0 - Mastered+
Journey to Rooted Hold - Mastered+
The City Beneath - Conquered, 55%
Gunthro and the Epic Blunder - Mastered+
The Second Sky - Conquered 40%

Smitemastery 101 - Mastered
Master Locks - Mastered
Devilishy Dangerous Dungeons of Doom - Mastered
Suit Pursuit - Conquered, 37%
Finding the First Truth - Conquered, 18%

×Brain = Hirn
Eighth = Achtel (other previous suggestions: Schnitz)
Evil Eye = Stierauge (other previous suggestions: Böses Auge, Starrendes Auge, Bösauge, Starrauge)
Force Arrow = Richtungspfeil (other previous suggestions: Schubpfeil, Bewegungspfeil, Kraftpfeil, Zwangpfeil, Drückpfeil, Einbahnpfeil)
Hold = Bau (other previous suggestions: Feste)
Orb = Kristallschalter
Roach = Schabe
Roach Queen = Schabenkönigin
Serpent = Panzerschlange (other previous suggestions: Bullschlange, [Schlange])
Spider = Spinne
Tar = Teer
Tar Baby = Teerbaby
Tar Mother = Teermutter
Trapdoor = Falltür
Wraithwing = Schreckschwinge (other previous suggestions: Grottenmotten, Flatterschleicher)
Master Door = Bezwingertür (other previous suggestions: Tür der Meister, Meistertür, Heldentür)
Delver = Absteiger (other previous suggestions: Gräber)

×
King Dugan's Dungeon 2.0 - Mastered+
Journey to Rooted Hold - Mastered+
The City Beneath - Conquered, 55%
Gunthro and the Epic Blunder - Mastered+
The Second Sky - Conquered 40%

Smitemastery 101 - Mastered
Master Locks - Mastered
Devilishy Dangerous Dungeons of Doom - Mastered
Suit Pursuit - Conquered, 37%
Finding the First Truth - Conquered, 18%

×
Brain = Hirn
Eighth = Achtel
Evil Eye = Stierauge works for me. (Heh, how'bout "Bullauge"? )
Force Arrow = Richtungspfeil is a bit long, but seems the best choice.
Hold = Feste. My first association with "Bau" is the hole dug by a fox or badger.
Orb = Schaltkugel, maybe? I don't like "crystal" in the name for something designed to be whacked with a really big sword.
Roach = Schabe
Roach Queen = Schabenkönigin
Serpent = Panzerschlange is good for suggesting "swordproof", I guess. No strong preference.
Spider = Spinne
Tar = Teer
Tar Baby = Teerbaby
Tar Mother = Teermutter. Obvious, but I really like the parallel to "Essigmutter".
Trapdoor = Falltür
Wraithwing = Fledergeist. I hear too much Flugheuschrecke in "Schreckschwinge". (Grottenmotte was never meant seriously, btw. It belongs in a universe where rattlesnakes are called Ratternattern, and the golem-pile-eating adders Schotterottern.)
Delver = Absteiger
Neather = "der Darunter" is quite close in sense to the English, and reasonably enigmatic.
Smitemaster = Hiebmeister
Master Door = Meistertür. Translate "master" parallel to the usage in "smitemaster", whose professional pride requires him to completely clear every room.
Exterminator = Kammerjäger. One of the most bestest words in the German language, and clearly the one to use here as far as I'm concerned.
Dungeon exterminator = ... not sure. Verlies-Kammerjäger? Dunkelkammerjäger?
Potion = Trank
Mimic = Äffer (to mimic 'nachäffen')
Level = Stockwerk (very profane, everydayish; but it's Beethro's day job after all.) Or maybe Niveau. Level is too game-oriented, and doesn't suit in-world text.
Room = Raum
Dungeon = Verlies(e)
Backswiping = Durchgangshieb (reminds me of the en passant chess move, and gives off a kind of smitemaster's technical vocabulary vibe)
Really big sword = echt grosses Schwert
multi-level dungeon = mehrstöckige Verliese
Mastery Area = Meisterzone
Mastery Level = Meisterlevel (calling it a level seems fine in this meta-ish context).
post-master (as in "post-mastering the hold") = I'm not sure what that even means, and very open to suggestions.
Achievement = ... "Spieleerfolge" sounds rubbish, probably the wiki editor's ad-hoc translation of "game scores" or "game achievements". Any Germans with some kind of console? Otherwise we could just go with "Trophäen", which another system seems to use.

×
"Achievement = Errungenschaft" -- Huh. Turns out that's what Steam calls them in the German interface. OK, we'll go with that I guess.

"Dungeon Exterminator = Kerkerjäger" -- I kind of like this one; but I need to go look at the context where it's introduced. We should keep the information that in an Eighth context, Beethro is your basic comes-to-your-house-and-kills-roaches guy; it's just that exterminators there need to take a more one-on-one approach to pest removal.

"Mimic = Hologramm
Mimic Potion = Holotrank" -- Dislike. Hologramm is too Earth-technology-ish, and too intangible. If anything is a "Hologramm", it's decoys, and even there it's a bad fit because roaches are said to smell, not see, them.

"Level = Ebene" -- Certainly the standard translation in the game-related context. Could be used where I suggested "Level" in an earlier post, but I'm still in favour of keeping things jarringly mundane for any in-game text. My "Stockwerk" does suggest "above ground" though, which is a problem.

"Dungeon (in compounds) = Kerker" -- Aaaah, thank you. Much better than "Verlies" IMO.

"(King Dugan's) multi-level dungeon = Maybe "King Dugan´s tiefes/finsteres Verlies" - This would somehow imply the multi levels." -- How 'bout "König Dugans weitläufiger Kerker", implying no more than that it's promising to be a big job for Beethro? This is not a proper name to be standardised btw. It appears only once and in a descriptive function.

"Neather = Unterling?" -- "Unterling" is a not entirely uncommon word meaning "flunkey", "minion". It would give an inappropriately self-belittling tone to the Neather.

"Smitemaster = Schwertmeister" -- Not bad. Not bad at all.

×"Mimic = Hologramm
Mimic Potion = Holotrank" -- I also dislike them because mimics seem to be real people, just without an autonomous mind. So they mimic everything they see from their creator. I still vote for "Äffer".

"König Dugans weitläufiger Kerker" is good. As is "Achievement = Errungenschaft". Kerker for "dungeon" will also work much better.

"Smitemaster = Schwertmeister" -- Although it can be understood, it just doesn't get the real meaning. Because Beethro isn't a real master with the sword, he is just very good at smiting creatures with it. See how slow he turns his sword - I wouldn't say that he really masters the swordhandling. But of course the word sounds more beautiful than "Hiebmeister". Isn't there any word that intends some sort of killing and also sounds good in conjunction with "meister"? Stückelmeister, Hackmeister, Tilgmeister, Schneidmeister? All do not sound really better..

×
King Dugan's Dungeon 2.0 - Mastered+
Journey to Rooted Hold - Mastered+
The City Beneath - Conquered, 55%
Gunthro and the Epic Blunder - Mastered+
The Second Sky - Conquered 40%

Smitemastery 101 - Mastered
Master Locks - Mastered
Devilishy Dangerous Dungeons of Doom - Mastered
Suit Pursuit - Conquered, 37%
Finding the First Truth - Conquered, 18%