The shortcuts are stored in $HOME/.config/kglobalshortcutsrc
For example:
[kwin]
Activate Window Demanding Attention=Meta+Shift+A,Ctrl+Alt+A,Activate Window Demanding Attention
Expose=Meta+F9,Ctrl+F9,Toggle Present Windows (Current desktop)
ExposeAll=Meta+F10\tLaunch (C),Ctrl+F10\tLaunch (C),Toggle Present Windows (All desktops)
ExposeClass=Meta+F7,Ctrl+F7,Toggle Present Windows (Window class)
Kill Window=Meta+Ctrl+Esc,Ctrl+Alt+Esc,Kill Window
MoveMouseToCenter=Meta+F6,Meta+F6,Move Mouse to Centre
MoveMouseToFocus=Meta+F5,Meta+F5,Move Mouse to Focus
MoveZoomDown=none,none,Move Zoomed Area Downwards
MoveZoomLeft=none,none,Move Zoomed Area to Left
MoveZoomRight=none,none,Move Zoomed Area to Right
MoveZoomUp=none,none,Move Zoomed Area Upwards
Overview=Meta+Shift+W,Meta+W,Toggle Overview
Show Desktop=Meta+D,Meta+D,Show Desktop
ShowDesktopGrid=Meta+F8,Ctrl+F8,Show Desktop Grid
Suspend Compositing=Meta+Shift+F12,Alt+Shift+F12,Suspend Compositing
Switch One Desktop Down=Meta+Ctrl+Down,Meta+Ctrl+Down,Switch One Desktop Down
Switch One Desktop Up=Meta+Ctrl+Up,Meta+Ctrl+Up,Switch One Desktop Up
Switch One Desktop to the Left=Meta+Ctrl+Left,Meta+Ctrl+Left,Switch One Desktop to the Left
Switch One Desktop to the Right=Meta+Ctrl+Right,Meta+Ctrl+Right,Switch One Desktop to the Right
Switch Window Down=Meta+Alt+Down,Meta+Alt+Down,Switch to Window Below
Switch Window Left=Meta+Alt+Left,Meta+Alt+Left,Switch to Window to the Left
Switch Window Right=Meta+Alt+Right,Meta+Alt+Right,Switch to Window to the Right
Switch Window Up=Meta+Alt+Up,Meta+Alt+Up,Switch to Window Above
Switch to Desktop 1=Meta+Ctrl+F1,Ctrl+F1,Switch to Desktop 1
Switch to Desktop 2=Meta+Ctrl+F2,Ctrl+F2,Switch to Desktop 2
Switch to Desktop 3=Meta+Ctrl+F3,Ctrl+F3,Switch to Desktop 3
Switch to Desktop 4=Meta+Ctrl+F4,Ctrl+F4,Switch to Desktop 4
Toggle Night Color=none,none,Toggle Night Colour
Walk Through Windows=Alt+Tab,Alt+Tab,Walk Through Windows
Walk Through Windows (Reverse)=Alt+Shift+Backtab,Alt+Shift+Backtab,Walk Through Windows (Reverse)
Walk Through Windows of Current Application=Alt+`,Alt+`,Walk Through Windows of Current Application
Walk Through Windows of Current Application (Reverse)=Alt+~,Alt+~,Walk Through Windows of Current Application (Reverse)
Window Close=Alt+F4,Alt+F4,Close Window
Window Maximize=Meta+PgUp,Meta+PgUp,Maximise Window
Window Minimize=Meta+PgDown,Meta+PgDown,Minimise Window
Window One Desktop Down=Meta+Ctrl+Alt+Down\tMeta+Ctrl+Shift+Down,Meta+Ctrl+Shift+Down,Window One Desktop Down
Window One Desktop Up=Meta+Ctrl+Alt+Up\tMeta+Ctrl+Shift+Up,Meta+Ctrl+Shift+Up,Window One Desktop Up
Window One Desktop to the Left=Meta+Ctrl+Alt+Left\tMeta+Ctrl+Shift+Left,Meta+Ctrl+Shift+Left,Window One Desktop to the Left
Window One Desktop to the Right=Meta+Ctrl+Alt+Right\tMeta+Ctrl+Shift+Right,Meta+Ctrl+Shift+Right,Window One Desktop to the Right
Window Operations Menu=Meta+Space,Alt+F3,Window Operations Menu
Window Quick Tile Bottom=Meta+Down,Meta+Down,Quick Tile Window to the Bottom
Window Quick Tile Left=Meta+Left,Meta+Left,Quick Tile Window to the Left
Window Quick Tile Right=Meta+Right,Meta+Right,Quick Tile Window to the Right
Window Quick Tile Top=Meta+Up,Meta+Up,Quick Tile Window to the Top
Window to Next Screen=Meta+Shift+Right,Meta+Shift+Right,Window to Next Screen
Window to Previous Screen=Meta+Shift+Left,Meta+Shift+Left,Window to Previous Screen
_k_friendly_name=KWin
view_actual_size=none,Meta+0,Actual Size
view_zoom_in=Meta+=,Meta+=,Zoom In
view_zoom_out=Meta+-,Meta+-,Zoom Out