Progress
The Progress page in the game-options shows how many Perks you have tried, Spells you have cast at least once, and Enemies you have killed. Tooltips show you the in-game details, plus the Enemies show how many you have killed and their kill-count of you.
Secrets
There are a maximum of 41 secrets, from unmodded playthroughs. The message shown above the Progress listings – "Discovered the secrets above and below - N secret(s) found" – is calculated based on the number of unique Orbs of True Knowledge you have ever collected (up to 36), plus how many of the five Endings-related secrets you have completed (Greed ending, Toxic ending, Peaceful ending, entering NewGame+, and collecting a corrupted Orb of True Knowledge).
100.6%
The "Enemies" listing has a denominator of 171 for 100% progress, but there are 172 enemies in the game, which often leads to the Progress screen reporting 172/171 or 100.6% completion for experienced players. This is a result of the game tracking progress for both left-facing and right-facing Torjuntalaite - their stats are combined in the icon, but each direction will result in an additional enemy killed for Progress.
Interactive version
There is an interactive version of the image below, with mouse-over for their names, and links to the specific wiki-pages at:
Plain image
