ℹ️ Open inspector using F12 and toggle to "console" (credits to GENiEBEN for finding it). There are multiple ways to use the console to unlock achievements. Here is one of them:
Start new game and use the following command:
cr_getC2Runtime().changelayout = cr_getC2Runtime().layouts["5"];
Change "5", to "10" and "15" to go to the corresponding levels.
Run the following code to obtain the last achievement:
var r = cr_getC2Runtime();
r.eventsheets['end'] = r.eventsheets['general'];
r.changelayout = r.layouts['end'];